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Debt 0.75% Senior convertible notes (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Nov. 30, 2018	Jun. 30, 2017	May 12, 2017
Senior Convertible Notes
Net carrying amount of Senior Convertible Notes due 2022	$ 1,010,300,000	$ 327,600,000
Senior Notes
Senior Convertible Notes
Fair value of outstanding notes:	1,399,800,000	381,300,000
Amount by which the notes’ if-converted value exceeds their principal amount:	125,400,000	0
Senior Notes | Convertible Notes due 2023
Senior Convertible Notes
Principal amount	850,000,000	0	$ 750,000,000
Unamortized debt discount	(171,800,000)	0
Unamortized debt issuance costs	(10,500,000)	0
Net carrying amount of Senior Convertible Notes due 2022	667,700,000	0
Fair value of outstanding notes:	859,600,000	0
Amount by which the notes’ if-converted value exceeds their principal amount:	0	0
Senior Notes | Zero Point Seven Five Percent Senior Convertible Notes
Senior Convertible Notes
Total net carrying amount of senior convertible notes	1,010,300,000	327,600,000
Senior Notes | Convertible Notes due 2022
Senior Convertible Notes
Principal amount	400,000,000.0	400,000,000.0		$ 50,000,000.0	$ 350,000,000.0
Unamortized debt discount	(51,100,000)	(64,400,000)
Unamortized debt issuance costs	(6,300,000)	(8,000,000)
Net carrying amount of Senior Convertible Notes due 2022	342,600,000	327,600,000
Fair value of outstanding notes:	540,200,000	381,300,000
Amount by which the notes’ if-converted value exceeds their principal amount:	$ 125,400,000	$ 0

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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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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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