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Long-Term Debt and Finance Lease Obligations - Amortization of Debt Issuance Costs and Debt Maturities (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Amortization of debt issue costs and accretion of debt discount      
Amortization of deferred issuance costs $ 0.9 $ 2.4 $ 2.4
Amortization of debt discount 0.8 $ 2.3 $ 2.3
Maturities of long-term debt, excluding finance lease obligations      
2023 16.3    
2024 7.3    
2025 7.3    
2026 7.3    
2027 7.3    
Thereafter 686.2    
Total principal maturities of long-term debt $ 731.7