Long-term Debt - Schedule of Debt (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Debt Instrument [Line Items]
Finance lease obligations	$ 25.0		$ 23.6
Less: Debt issuance costs	(9.4)		(9.8)
Total debt	335.6		333.8
Less: Current portion of long-term debt	13.2		13.2
Long-term debt	322.4		320.6
Interest expense	18.4	$ 39.4
Interest Paid, Capitalized, Investing Activities	19.1	37.2
Other Noncash Expense	1.6	3.8
Financial assurance instruments
Debt Instrument [Line Items]
Interest expense	12.0	13.5
Indebtedness
Debt Instrument [Line Items]
Interest expense	6.4	$ 25.9
Senior Notes | 3.250% Convertible Senior Notes due March 2028 (2028 Convertible Notes)
Debt Instrument [Line Items]
Long-term debt	$ 320.0		$ 320.0
Stated interest rate	3.25%