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Emergence from the Chapter 11 Cases and Fresh Start Reporting - Issuance of Equity Securities (Details)
$ / shares in Units, $ in Millions
Apr. 01, 2017
USD ($)
days
$ / shares
shares
Jul. 03, 2017
Jun. 30, 2017
shares
Effect of Plan      
Fresh-Start Adjustment [Line Items]      
Common stock, shares issued (in shares)     137,300,000
Warrant      
Fresh-Start Adjustment [Line Items]      
Warrants unexercised, percent     0.10%
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    
Series A Preferred Stock | Preferred Stock | Effect of Plan      
Fresh-Start Adjustment [Line Items]      
Preferred stock, dividend rate 8.50%    
Preferred stock, liquidation preference per share | $ / shares $ 25.00    
Preferred stock, conversion price (in dollars per share) | $ / shares $ 16.25    
Discount percent of common stock value 35.00%    
Minimum number of shares outstanding before redemption of all shares 7,500,000    
Redemption price per share (in dollars per share) | $ / shares $ 25    
Holders of stock, conversion threshold, percent 66.66%    
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    
Dividend threshold payable an any 12 month period for fundamental change | $ $ 100.0    
Section 1145 Securities | Effect of Plan      
Fresh-Start Adjustment [Line Items]      
Stock issued (in shares) | $ $ 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 (in shares) | $ $ 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 (in shares) | $ $ 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 | Effect of Plan      
Fresh-Start Adjustment [Line Items]      
Common stock, shares issued (in shares)     3,600,000
Minimum | Series A Preferred Stock | Preferred Stock | Effect of Plan      
Fresh-Start Adjustment [Line Items]      
Redemption notice period 30 days    
Maximum | Series A Preferred Stock | Preferred Stock | Effect of Plan      
Fresh-Start Adjustment [Line Items]      
Redemption notice period 60 days    
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 | Warrant | Effect of Plan      
Fresh-Start Adjustment [Line Items]      
Warrants unexercised, percent   0.10%