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Long-Term Debt, Debt Maturity (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Maturity of the Company's long-term debt over each of the next five years  
2021 $ 230.5
2022 295.6
2023 0.7
2024 350.5
2025 400.0
Thereafter 2,617.0
Debt (exclusive of unamortized deferred debt issuance costs) $ 3,894.3