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Long-Term Debt Long-term Debt Maturity Schedule (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]  
2017 $ 52.2
2018 227.7
2019 26.3
2020 426.5
2021 630.2
Thereafter 2,687.9
Debt $ 4,050.8