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Debt - Schedule of Interest Expense (Details) - Senior Notes - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
2027 Notes
Debt Instrument [Line Items]
Contractual interest coupon	$ 5.7
Amortization of debt issuance costs	0.2
Total	5.9
2022 Notes
Debt Instrument [Line Items]
Contractual interest coupon	13.8	$ 47.3	$ 47.3
Amortization of debt issuance costs	0.7	2.4	2.4
Total	14.5	49.7	49.7
2021 Notes
Debt Instrument [Line Items]
Contractual interest coupon	4.6	8.9	11.8
Amortization of debt discount	3.1	5.5	6.6
Amortization of debt issuance costs	0.5	0.9	1.2
Total	$ 8.2	$ 15.3	$ 19.6

X

- Definition

Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Amount of amortization expense attributable to debt issuance costs.

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

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