Debt (Summary of Debt) (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023	Mar. 15, 2023
Debt [Line Items]
Weighted average interest rate	7.14%
Short-term debt	$ 31.4	$ 13.7
Total long-term debt	2,729.3	3,075.8
Less: current portion of long-term debt	4.4	14.2
Long-term debt	2,724.9	3,061.6
Term Loans
Debt [Line Items]
Less: unamortized debt issuance costs	$ (8.6)	(15.0)
CAD TLA Facility | Term Loans
Debt [Line Items]
Weighted average interest rate	7.08%
Long-term debt:	$ 78.0	83.1
USD TLA Facility | Term Loans
Debt [Line Items]
Weighted average interest rate	7.64%
Long-term debt:	$ 1,325.0	1,675.0
6.75% Senior secured notes due in March 2028 | Secured Debt
Debt [Line Items]
Interest rate	6.75%		6.75%
Long-term debt:	$ 550.0	550.0
Less: unamortized debt issuance costs	$ (5.6)	(6.8)
7.75% Senior unsecured notes due in March 2031 | Unsecured Debt
Debt [Line Items]
Interest rate	7.75%		7.75%
Long-term debt:	$ 800.0	800.0
Less: unamortized debt issuance costs	$ (9.5)	$ (10.5)