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Accounts Payable and Accrued Expenses - Schedule of Accounts Payable and Accrued Expenses (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Payables And Accruals [Abstract]    
Trade accounts payable $ 239.1 $ 204.9
Employee-related expenses 49.9 59.7
Accrued vacation 23.2 23.8
Miscellaneous accrued expenses 79.1 87.4
Total $ 391.3 $ 375.8