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Debt - Schedule of Interest Expense (Details) - Senior Notes - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
2027 Notes
Debt Instrument [Line Items]
Contractual interest coupon	$ 8.3	$ 8.3
Amortization of debt issuance costs	0.3	0.3
Total	$ 8.6	8.6
2021 Notes
Debt Instrument [Line Items]
Contractual interest coupon		0.8
Amortization of debt discount		0.5
Amortization of debt issuance costs		0.1
Total		$ 1.4

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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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