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Long-Term Debt, Debt Maturity (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Maturity of the Company's long-term debt over each of the next five years  
2020 $ 403.5
2021 228.2
2022 295.2
2023 0.3
2024 745.5
Thereafter 1,957.6
Debt (exclusive of unamortized deferred debt issuance costs) $ 3,630.3