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Debt - Debt Maturity Schedule (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Maturities of Long-term Debt [Abstract]    
2017 $ 40.4  
2018 8.8  
2019 8.3  
2020 7.0  
2021 1,196.1  
Thereafter 307.8  
Total debt $ 1,568.4 $ 1,584.1