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Debt - Schedule of senior convertible notes (Details) - USD ($)	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018	Nov. 30, 2018	Jun. 30, 2017
Senior Notes [Abstract]
Net carrying amount of Senior Convertible Notes due 2022	$ 1,034,700,000		$ 1,010,300,000
Senior Notes
Senior Notes [Abstract]
Fair value of outstanding senior convertible notes:	1,635,200,000		1,399,800,000
Amount by which the notes' if-converted value exceeds their principal amount:	322,500,000	$ 125,400,000
Senior Notes | Senior convertible notes due 2022
Senior Notes [Abstract]
Principal amount	400,000,000.0		400,000,000.0		$ 400,000,000.0
Unamortized debt discount	(44,200,000)		(51,100,000)
Unamortized debt issuance costs	(5,500,000)		(6,300,000)
Net carrying amount of Senior Convertible Notes due 2022	350,300,000		342,600,000
Fair value of outstanding senior convertible notes:	638,300,000		540,200,000
Amount by which the notes' if-converted value exceeds their principal amount:	225,500,000	125,400,000
Senior Notes | Senior convertible notes due 2023
Senior Notes [Abstract]
Principal amount	850,000,000.0		850,000,000.0	$ 850,000,000.0
Unamortized debt discount	(156,100,000)		(171,800,000)
Unamortized debt issuance costs	(9,500,000)		(10,500,000)
Net carrying amount of Senior Convertible Notes due 2022	684,400,000		667,700,000
Fair value of outstanding senior convertible notes:	996,900,000		859,600,000
Amount by which the notes' if-converted value exceeds their principal amount:	97,000,000.0	$ 0
Senior Notes | Zero Point Seven Five Percent Senior Convertible Notes
Senior Notes [Abstract]
Total net carrying amount of senior convertible notes	$ 1,034,700,000		$ 1,010,300,000

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- Definition

Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock.

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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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The amount by which the convertible debt's if-converted value exceeds its principle amount at the balance sheet date, regardless of whether the instrument is currently convertible. This element applies to public companies only.

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

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Amount, after accumulated amortization, of debt discount.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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