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Amount of cost to be recognized for option under share-based payment arrangement.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Number of additional shares authorized for issuance under share-based payment arrangement.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest exercisable or convertible options. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Maximum number of shares that may be issued in accordance with the plan as a proportion of outstanding capital stock.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Stockholders' Equity - Additional Information (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) Plan $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of share-based employee compensation plans \| Plan	3
Weighted-average fair value of employee stock options \| $ / shares	$ 14.69	$ 6.99
Fair values of options vested \| $	$ 23.3	$ 24.8	$ 58.6
Intrinsic values of stock options exercised \| $	$ 44.0	289.1	276.5
Maximum \| 2017 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of capital stock outstanding	5.00%
Shares reserved for issuance, automatic increase date	Jan. 01, 2027
Minimum \| 2017 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares reserved for issuance, automatic increase date	Jan. 01, 2018
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average recognition period	2 years
Unrecognized compensation cost related to stock options granted and assumed \| $	$ 17.7
Stock Options \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Maximum term for stock options from the grant date	10 years
RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Fair value of vested shares \| $	$ 937.2	$ 884.1	966.0
RSUs are vested but not settled	9,400,000	22,400,000
Pre-2017 RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock issued	26,700,000
Unrecognized compensation cost \| $	$ 34.5
Weighted average recognition period	9 months 18 days
Post-2017 RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation cost \| $	$ 1,400.0
Weighted average recognition period	2 years 10 months 24 days
RSAs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Fair value of vested shares \| $	$ 27.5	$ 6.3	$ 1.6
Unrecognized compensation cost \| $	$ 74.2
Weighted average recognition period	3 years 3 months 18 days
Class A Non-voting Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock authorized to issue	3,000,000,000	3,000,000,000
Common stock par value \| $ / shares	$ 0.00001	$ 0.00001
Common stock voting rights	no voting rights
Common stock dividends declared \| $ / shares	$ 0
Common stock issued	1,160,127,014	999,304,000
Common stock outstanding	1,160,127,014	999,304,000
Class A Non-voting Common Stock \| 2017 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for future issuance	87,270,108
Class A Non-voting Common Stock \| 2014 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for future issuance	17,858,235
Class A Non-voting Common Stock \| 2012 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for future issuance	11,004,580
Class A Non-voting Common Stock \| 2017 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for future issuance	16,484,690
Number of shares issued or offered under plan	0
Class A Non-voting Common Stock \| Maximum \| 2017 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Additional common stock reserved for future issuance	86,737,997
Class A Non-voting Common Stock \| Maximum \| 2017 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares reserved for issuance, automatic increase date	Jan. 01, 2027
Percentage of number of shares, common stock outstanding	1.00%
Increase in number of shares reserved for issuance	15,000,000
Class A Non-voting Common Stock \| Minimum \| 2017 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares reserved for issuance, automatic increase date	Jan. 01, 2018
Class A Non-voting Common Stock \| 2014 Equity Incentive Plan \| Maximum \| France
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Awards granted to employees and consultants	2,500,000
Class A Non-voting Common Stock \| Stock Options And Unvested RSUs \| 2014 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for future issuance	96,993,064
Class A Non-voting Common Stock \| Stock Options And Unvested RSUs \| 2012 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock reserved for future issuance	37,228,865
Class A Non-voting Common Stock \| RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Awards granted to employees and consultants	89,582,000
RSUs are vested but not settled	76,983,000
Class A Non-voting Common Stock \| RSAs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Awards granted to employees and consultants	3,975,000
RSUs are vested but not settled	2,778,000
Class B Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock authorized to issue	700,000,000	700,000,000
Common stock par value \| $ / shares	$ 0.00001	$ 0.00001
Common stock voting rights	one vote
Common stock dividends declared \| $ / shares	$ 0
Common stock issued	24,521,607	93,845,000
Common stock outstanding	24,521,607	93,845,000
Class B Common Stock \| RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
RSUs are vested but not settled	490,000
Class C Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock authorized to issue	260,887,848	260,888,000
Common stock par value \| $ / shares	$ 0.00001	$ 0.00001
Common stock voting rights	ten votes
Common stock dividends declared \| $ / shares	$ 0
Common stock issued	231,147,476	224,611,000
Common stock outstanding	231,147,476	224,611,000