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Discontinued Operations Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Apr. 01, 2017
Liabilities:      
Liabilities subject to compromise     $ 8,416.7
Successor      
Assets:      
Other current assets $ 0.0 $ 0.3  
Total assets classified as discontinued operations 0.0 0.3  
Liabilities:      
Accounts payable and accrued expenses 54.0 70.6  
Other noncurrent liabilities 141.1 170.0  
Total liabilities classified as discontinued operations $ 195.1 $ 240.6