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Issuance of Equity Securities (Details) - shares
shares in Millions
9 Months Ended 12 Months Ended 33 Months Ended
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Jan. 31, 2018
Apr. 01, 2017
Fresh-Start Adjustment [Line Items]            
Treasury stock, shares, acquired 5.8 14.6 21.1 41.5    
Effect of Plan            
Fresh-Start Adjustment [Line Items]            
Common stock, outstanding (in shares)           70.9
Discount percent of common stock value           35.00%
Convertible preferred stock, shares issued upon conversion           46.2
Convertible Preferred Stock            
Fresh-Start Adjustment [Line Items]            
Preferred Stock, shares issued (in shares)   0.0 30.0 0.0 30.0  
Common Stock            
Fresh-Start Adjustment [Line Items]            
Common stock, outstanding (in shares)   139.2 137.7 139.2    
Common Stock | Common Stock            
Fresh-Start Adjustment [Line Items]            
Convertible preferred stock, shares issued upon conversion         59.3