v3.19.3.a.u2
Income Taxes - Tax Rate Reconciliation (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
Federal statutory income tax rate 21.00% 21.00% 35.00%
State income tax expense (0.10%) 1.70% 0.20%
Foreign rate differential (3.80%) 29.60% (14.40%)
Foreign rate differential - gain on divestiture 0.00% (83.10%) 0.00%
Non-deductible expenses (1.30%) 0.80% (1.20%)
Stock-based compensation 1.20% (2.60%) (0.20%)
Interest on convertible notes (0.30%) 15.10% (2.80%)
Gain on convertible notes 1.10%   0.00%
Federal research and development credits 3.10% (7.20%) 2.00%
Deferred tax on foreign investments 0.00% 51.40% 0.00%
Entity restructuring 92.30%   0.00%
Entity restructuring   (20.00%)  
Change in unrecognized tax benefits (17.00%) 9.90% (0.90%)
Valuation allowance (97.30%) 4.90% (21.80%)
Impact of the Tax Act 0 0 0.158
Global Intangible Low-taxed Income (1.60%) 0.00% 0.00%
Other interest 1.80% 0.00% 0.00%
Other, net 0.40% 0.10% 0.10%
Effective income tax rate (0.50%) 21.60% 11.80%
Deferred tax asset from repatriation of assets   $ 275