Debt and Credit Arrangements - Interest Expense, Net (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Debt Instrument
Interest expense, debt	$ 299.0
Revolving Credit Facility
Debt Instrument
Interest expense, debt	147.2	$ 23.4	$ 9.0
Senior Secured And Unsecured Notes
Debt Instrument
Interest income	21.5
Senior secured notes due 2030 | Secured Debt
Debt Instrument
Interest expense, debt	109.7	3.0
Senior unsecured notes due 2031 | Unsecured Debt
Debt Instrument
Interest expense, debt	48.6	1.3
Senior Secured Revolving Credit Facility due October 2026 | Revolving Credit Facility
Debt Instrument
Interest expense, debt	$ 27.7	$ 23.4	$ 2.5