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Debt - Components of Interest Expense and Effective Interest Rates of Senior Convertible Notes (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	May 31, 2020	Nov. 30, 2018	Mar. 31, 2018	Jun. 12, 2017
Cash interest expense:
Contractual coupon interest	$ 2,400,000	$ 2,300,000
Non-cash interest expense:
Accretion of debt discount	20,500,000	11,800,000
Amortization of debt issuance costs	1,100,000	900,000
Total interest expense recognized on senior notes	24,000,000.0	$ 15,000,000.0
Senior Notes
Non-cash interest expense:
Principal amount	$ 2,057,500,000		$ 2,057,500,000
Senior Convertible Notes due 2022
Non-cash interest expense:
Effective interest rate (as a percent)		5.10%
Senior Convertible Notes due 2022 | Senior Notes
Non-cash interest expense:
Principal amount							$ 400,000,000.0
Interest rate on convertible notes (as a percent)						0.75%
Senior Convertible Notes due 2023
Non-cash interest expense:
Effective interest rate (as a percent)	5.60%	5.60%
Senior Convertible Notes due 2023 | Senior Notes
Non-cash interest expense:
Principal amount	$ 850,000,000.0		850,000,000.0		$ 850,000,000.0
Interest rate on convertible notes (as a percent)					0.75%
Senior Convertible Notes due 2025
Non-cash interest expense:
Effective interest rate (as a percent)	5.50%
Senior Convertible Notes due 2025 | Senior Notes
Non-cash interest expense:
Principal amount	$ 1,207,500,000		$ 1,207,500,000	$ 1,210,000,000
Interest rate on convertible notes (as a percent)				0.25%

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Cash Interest Expense [Abstract]

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Non-Cash Interest Expense [Abstract]

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The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method.

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Amount of amortization expense attributable to debt issuance costs.

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

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs.

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