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Debt - Aggregate Annual Maturities (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Aggregate annual maturities of debt    
2017 $ 15.4  
2018 24.1  
2019 39.5  
2020 56.1  
2021 1,049.0  
Thereafter 2.1  
Total debt $ 1,186.3 $ 772.2