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Revenues - Receivables (Details) - Successor - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Trade receivables, net $ 345.5 $ 504.2
Miscellaneous receivables, net 104.9 47.9
Accounts receivable, net $ 450.4 $ 552.1