Debt - Future Maturities of Long-Term Debt (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Future maturities of long-term debt
Year 1: Long-term debt maturities	$ 0.1
Year 2: Long-term debt maturities	399.3
Year 3: Long-term debt maturities	349.9
Year 4: Long-term debt maturities	1.0
Year 5: Long-term debt maturities	1.0
Year 6 and thereafter: Long-term debt maturities	3,179.6
Long-term debt carrying amount	$ 3,930.9	$ 3,997.0

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

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