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Issuance of Equity Securities (Details)
$ / shares in Units, $ in Millions
 2 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2018
shares
Apr. 01, 2017
USD ($)
days
$ / shares
shares
Feb. 19, 2018
shares
Dec. 31, 2017
shares
Dec. 31, 2017
shares
Jul. 03, 2017
Fresh-Start Adjustment [Line Items]            
Treasury stock, shares, acquired         5,800,000  
Effect of Plan            
Fresh-Start Adjustment [Line Items]            
Common stock, outstanding (in shares)       130,700,000 130,700,000  
Warrant | Effect of Plan            
Fresh-Start Adjustment [Line Items]            
Number of securities called by each right   1        
Exercise price | $ / shares   $ 0.01        
Warrants issued (in shares)   6,200,000        
Warrants unexercised, percent           0.10%
Preferred Stock            
Fresh-Start Adjustment [Line Items]            
Conversion of Stock, Shares Converted         17,200,000  
Series A Preferred Stock | Preferred Stock | Effect of Plan            
Fresh-Start Adjustment [Line Items]            
Preferred stock, dividend rate   8.50%        
Preferred stock, conversion price (in dollars per share) | $ / shares   $ 16.25        
Discount percent of common stock value   35.00%        
Threshold price of common stock | $ / shares   $ 32.50        
Threshold trading days | days   45        
Threshold consecutive trading days | days   60        
Threshold last trading days in consecutive trading period | days   20        
Conversion period threshold after initial issuance   3 years        
Section 1145 Securities | Effect of Plan            
Fresh-Start Adjustment [Line Items]            
Stock issued | $   $ 704.4        
Section 1145 Securities | Common Stock | Effect of Plan            
Fresh-Start Adjustment [Line Items]            
New shares issued (in shares)   51,200,000        
Section 1145 Securities | Warrant | Effect of Plan            
Fresh-Start Adjustment [Line Items]            
New shares issued (in shares)   2,900,000        
Parties to Private Placement and Backstop Commitment Agreement | Section 4(a)(2) Securities | Common Stock | Effect of Plan            
Fresh-Start Adjustment [Line Items]            
New shares issued (in shares)   4,800,000        
Parties to Private Placement and Backstop Commitment Agreement | Section 4(a)(2) Securities | Warrant | Effect of Plan            
Fresh-Start Adjustment [Line Items]            
New shares issued (in shares)   3,100,000        
Parties to Private Placement Agreement | Section 4(a)(2) Securities | Preferred Stock | Effect of Plan            
Fresh-Start Adjustment [Line Items]            
Stock issued | $   $ 750.0        
Parties to Private Placement Agreement | Section 4(a)(2) Securities | Series A Preferred Stock | Preferred Stock | Effect of Plan            
Fresh-Start Adjustment [Line Items]            
New shares issued (in shares)   30,000,000        
Parties to Backstop Commitment Agreement | Section 4(a)(2) Securities | Effect of Plan            
Fresh-Start Adjustment [Line Items]            
Stock issued | $   $ 45.6        
Parties to Backstop Commitment Agreement | Section 4(a)(2) Securities | Common Stock | Effect of Plan            
Fresh-Start Adjustment [Line Items]            
New shares issued (in shares)   3,300,000        
Parties to Backstop Commitment Agreement | Section 4(a)(2) Securities | Warrant | Effect of Plan            
Fresh-Start Adjustment [Line Items]            
New shares issued (in shares)   200,000        
2017 Incentive Plan            
Fresh-Start Adjustment [Line Items]            
Treasury stock, shares, acquired       5,800,000    
2017 Incentive Plan | Effect of Plan            
Fresh-Start Adjustment [Line Items]            
Common stock, outstanding (in shares)       3,500,000 3,500,000  
Allowed Claims In Classes 2A, 2B, 2C, 2D And 5B | Rights Offering | Effect of Plan            
Fresh-Start Adjustment [Line Items]            
Units authorized   54,500,000.0        
Number of securities called by each right   1        
Exercise price | $ / shares   $ 13.75        
Rights offering, units purchased   51,200,000        
Allowed Claims In Classes 2A, 2B, 2C, 2D And 5B | Section 1145 Securities | Common Stock | Effect of Plan            
Fresh-Start Adjustment [Line Items]            
New shares issued (in shares)   11,600,000        
Allowed Claims In Classes 2A, 2B, 2C, 2D And 5B | Parties to Backstop Commitment Agreement | Rights Offering | Effect of Plan            
Fresh-Start Adjustment [Line Items]            
Rights offering, units purchased   3,300,000        
Subsequent Event [Member]            
Fresh-Start Adjustment [Line Items]            
Treasury stock, shares, acquired     900,000      
Conversion of Stock, Shares Converted 13,200,000