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Debt - Senior Convertible Notes (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Nov. 30, 2018	Jun. 30, 2017
Senior Convertible Notes
Net carrying amount of Senior Convertible Notes	$ 1,059,700,000	$ 1,010,300,000
Senior Notes
Senior Convertible Notes
Total net carrying amount of senior convertible notes	1,059,700,000	1,010,300,000
Senior Notes | Senior convertible notes due 2022
Senior Convertible Notes
Principal amount	400,000,000.0	400,000,000.0		$ 400,000,000.0
Unamortized debt discount	(37,200,000)	(51,100,000)
Unamortized debt issuance costs	(4,600,000)	(6,300,000)
Net carrying amount of Senior Convertible Notes	358,200,000	342,600,000
Interest rate on convertible notes (as a percent)				0.75%
Carrying value of equity component of convertible senior notes, net of debt issuance costs	$ 70,600,000	$ 70,600,000
Remaining amortization period of debt discount on the liability component	2 years 6 months	3 years 6 months
Senior Notes | Senior convertible notes due 2023
Senior Convertible Notes
Principal amount	$ 850,000,000.0	$ 850,000,000.0	$ 850,000,000.0
Unamortized debt discount	(140,000,000.0)	(171,800,000)
Unamortized debt issuance costs	(8,500,000)	(10,500,000)
Net carrying amount of Senior Convertible Notes	701,500,000	667,700,000
Interest rate on convertible notes (as a percent)			0.75%	0.75%
Carrying value of equity component of convertible senior notes, net of debt issuance costs	$ 171,600,000	$ 171,600,000
Remaining amortization period of debt discount on the liability component	4 years	5 years

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Carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Convertible Notes Payable, excluding current portion. Convertible Notes Payable is a written promise to pay a note which can be exchanged for a specified amount of another, related security, at the option of the issuer and the holder.

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