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Gain on Settlement of Liabilities Subject to Compromise (Details) - USD ($)
$ in Millions
 12 Months Ended
Apr. 01, 2017
Dec. 31, 2018
Fresh-Start Adjustment [Line Items]    
Liabilities subject to compromise $ 8,416.7  
Less amounts issued to settle claims:    
Successor Series A Convertible Preferred Stock 1,305.4  
Issuance of Successor Notes 1,000.0  
Issuance of Successor Term Loan (950.0)  
Cash payments and accruals for claims and professional fees (336.4)  
Other:    
Write-off of Predecessor debt issuance costs, see also (e) below 18.1  
Total pre-tax gain on plan effects, see also (j) below 3,031.2  
Successor    
Less amounts issued to settle claims:    
Successor Common Stock 0.7  
Successor Additional paid-in capital $ 1,774.9  
Cash payments and accruals for claims and professional fees   $ 0.0
Other:    
Total pre-tax gain on plan effects, see also (j) below   $ 12.8