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Debt - Nominal Principal Amounts of Debt Maturities (Details)
$ in Millions
Dec. 31, 2017
USD ($)
Debt Disclosure [Abstract]  
2018 $ 22.7
2019 22.1
2020 11.5
2021 1,130.0
2022 488.0
After 2022 500.0
Total $ 2,174.3