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Debt instrument indenture date.

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The price per share of the conversion feature embedded in the debt instrument.

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Date the debt agreement requires the first payment to be made, in CCYY-MM-DD format.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Price of a single share of a number of saleable stocks of a company.

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Convertible Notes - Additional Information (Details)	1 Months Ended	3 Months Ended		9 Months Ended
Convertible Notes - Additional Information (Details)	Aug. 31, 2019 USD ($) d $ / shares shares	Sep. 30, 2019 USD ($) $ / shares	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) $ / shares	Sep. 30, 2018 USD ($)	Aug. 06, 2019 $ / shares
Debt Instrument [Line Items]
Proceeds from issuance of convertible notes, net of issuance costs		$ 1,251,848,000	$ 0	$ 1,251,848,000	$ 0
Convertible Senior Notes
Debt Instrument [Line Items]
Debt instrument, principal amount	$ 1,265,000,000	1,265,000,000		$ 1,265,000,000
Indenture date	Aug. 09, 2019
Proceeds from issuance of convertible notes, net of issuance costs	$ 1,150,000,000
Interest payment beginning date	Feb. 01, 2020
Debt instrument, interest rate	0.75%
Debt instrument, interest rate terms				Interest is payable in cash semi-annually in arrears beginning on February 1, 2020 at a rate of 0.75% per year.
Debt instrument, maturity date	Aug. 01, 2026
Debt instrument, redemption price percentage	100.00%
Carrying amount of equity component	$ 381,500,000	377,432,000		$ 377,432,000
Effective interest rate	6.22%
Debt issuance costs allocated to equity component	$ 4,100,000
Debt issuance costs allocated to liability component	$ 9,500,000
Debt instrument convertible, amortization period				6 years 9 months 18 days
Cap price, net cost		$ 102,100,000		$ 102,100,000
Convertible Senior Notes \| Class A Non-voting Common Stock
Debt Instrument [Line Items]
Shares issued upon conversion of each $1000 principal amount \| shares	43.8481
Debt instrument, convertible principal amount used in conversion rate	$ 1,000
Conversion price per share \| $ / shares	$ 22.81
Debt instrument convertible, percentage of conversion price	130.00%
Debt instrument convertible, number of trading days \| d	20
Debt instrument, redemption price percentage	100.00%
Cap price, per share \| $ / shares		$ 32.58		$ 32.58
Cap price per share, premium percentage above last reported sale price				100.00%
Last reported sale price, per share \| $ / shares						$ 16.29
Convertible Senior Notes \| Class A Non-voting Common Stock \| Maximum
Debt Instrument [Line Items]
Conversion price per share \| $ / shares		32.58		$ 32.58
Convertible Senior Notes \| Class A Non-voting Common Stock \| Minimum
Debt Instrument [Line Items]
Conversion price per share \| $ / shares		$ 22.81		$ 22.81
Convertible Senior Notes \| Class A Non-voting Common Stock \| Scenario One
Debt Instrument [Line Items]
Debt instrument convertible, percentage of conversion price	130.00%
Debt instrument convertible, number of trading days \| d	20
Debt instrument convertible, number of consecutive trading days \| d	30
Convertible Senior Notes \| Class A Non-voting Common Stock \| Scenario Two
Debt Instrument [Line Items]
Debt instrument, convertible principal amount used in conversion rate	$ 1,000
Debt instrument convertible, number of consecutive trading days \| d	10
Debt instrument, convertible, threshold business days	5 days
Convertible Senior Notes \| Class A Non-voting Common Stock \| Scenario Two \| Maximum
Debt Instrument [Line Items]
Debt instrument convertible, percentage of conversion price	98.00%
Initial Placement \| Convertible Senior Notes
Debt Instrument [Line Items]
Debt instrument, principal amount	$ 1,100,000,000
Over-Allotment Option \| Convertible Senior Notes
Debt Instrument [Line Items]
Debt instrument, principal amount	$ 165,000,000.0