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Debt - Interest Expense (Details) - Senior Notes - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
2027 Notes
Debt Instrument [Line Items]
Contractual interest coupon	$ 33.3	$ 5.7
Amortization of debt issuance costs	1.2	0.2
Total	34.5	5.9
2022 Notes
Debt Instrument [Line Items]
Contractual interest coupon		13.8	$ 47.3
Amortization of debt issuance costs		0.7	2.4
Total		14.5	49.7
2021 Notes
Debt Instrument [Line Items]
Contractual interest coupon	0.8	4.6	8.9
Amortization of debt discount	0.5	3.1	5.5
Amortization of debt issuance costs	0.1	0.5	0.9
Total	$ 1.4	$ 8.2	$ 15.3

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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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