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Accounts Payable and Accrued Expenses (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Payables and Accruals [Abstract]    
Trade accounts payable $ 197.8 $ 157.7
Employee-related expenses 30.9 28.1
Accrued vacation 21.9 21.8
Miscellaneous accrued expenses 85.5 113.6
Total $ 336.1 $ 321.2