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Long-Term Debt, Debt Maturity (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Maturity of the Company's long-term debt over each of the next five years  
2018 $ 1.1
2019 751.0
2020 400.7
2021 1,551.2
2022 500.2
Thereafter 351.3
Debt (exclusive of unamortized deferred debt issuance costs) $ 3,555.5