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Long-Term Debt - Future Maturities of Long-Term Debt (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Debt Disclosure [Abstract]  
2019 $ 1.5
2020 601.5
2021 1,365.0
2022 500.0
2023 700.0
Thereafter 1,800.0
Total $ 4,968.0