Debt - Future Maturities of Long-Term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Future maturities of long-term debt
Year 1: Long-term debt maturities	$ 421.6
Year 2: Long-term debt maturities	349.3
Year 3: Long-term debt maturities	0.1
Year 4: Long-term debt maturities	2.8
Year 5: Long-term debt maturities	496.9
Year 6 and thereafter: Long-term debt maturities	2,684.6
Long-term debt carrying amount	$ 3,955.3	$ 3,930.9

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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