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Long-Term Debt, Debt Maturity (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Maturity of the Company's long-term debt over each of the next five years  
2019 $ 764.4
2020 400.5
2021 998.6
2022 499.9
2023 0.2
Thereafter 920.9
Debt (exclusive of unamortized deferred debt issuance costs) $ 3,584.5