Debt (Summary of Debt) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Mar. 15, 2023
Debt [Line Items]
Weighted average interest rate	7.07%
Short-term debt	$ 27.7	$ 13.7
Total long-term debt	2,626.2	3,075.8
Less: current portion of long-term debt	4.1	14.2
Long-term debt	2,622.1	3,061.6
Term loans
Debt [Line Items]
Less: unamortized debt issuance costs	$ (7.0)	(15.0)
CAD TLA Facility | Term loans
Debt [Line Items]
Weighted average interest rate	5.85%
Long-term debt:	$ 72.5	83.1
USD TLA Facility | Term loans
Debt [Line Items]
Weighted average interest rate	6.92%
Long-term debt:	$ 1,225.0	1,675.0
Senior secured notes due in March 2028 | Secured Debt
Debt [Line Items]
Interest rate			6.75%
Long-term debt:	550.0	550.0
Less: unamortized debt issuance costs	(5.2)	(6.8)
Senior unsecured notes due in March 2031 | Unsecured Debt
Debt [Line Items]
Interest rate			7.75%
Long-term debt:	800.0	800.0
Less: unamortized debt issuance costs	$ (9.1)	$ (10.5)