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Revenues - Accounts Receivable (Details) - Successor - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Trade receivables, net $ 345.9 $ 504.2
Miscellaneous receivables, net 99.0 47.9
Accounts receivable, net $ 444.9 $ 552.1