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Debt - Senior Convertible Notes (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019	Nov. 30, 2018	Jun. 30, 2017
Debt Instrument [Line Items]
Carrying amount of liability component	$ 1,072,400,000	$ 1,059,700,000
Senior Notes
Debt Instrument [Line Items]
Unamortized debt discount	(165,400,000)	(177,200,000)
Unamortized debt issuance costs	(12,200,000)	(13,100,000)
Carrying amount of liability component	1,072,400,000	1,059,700,000
Carrying amount of equity component	242,200,000	242,200,000
Senior Notes | 0.75% Senior Convertible Notes due 2022
Debt Instrument [Line Items]
Principal amount	400,000,000.0	400,000,000.0		$ 400,000,000.0
Senior Notes | 0.75% Senior Convertible Notes due 2023
Debt Instrument [Line Items]
Principal amount	$ 850,000,000.0	$ 850,000,000.0	$ 850,000,000.0

X

- Definition

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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-Section S99
-Paragraph 1
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The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

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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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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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