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Share and Incentive-Based Compensation - Narrative (Details)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Feb. 28, 2017
shares
Oct. 31, 2016
$ / Unit
shares
Sep. 30, 2017
USD ($)
shares
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
$ / shares
shares
Sep. 30, 2016
USD ($)
$ / shares
shares
Successor            
Share and Incentive Based Compensation Arrangement            
Performance units vesting period   3 years        
Performance units weighted average grant date fair value | $ / Unit   100        
Performance units compensation expense     $ 0.5   $ 2.1  
Performance units compensation, capitalized     0.1   0.3  
Performance units liability     2.5   $ 2.5  
Successor | Restricted Stock            
Share and Incentive Based Compensation Arrangement            
Shares granted | shares   1,400,000     640,000  
Vesting period   3 years     2 years 6 months  
Share-based compensation expense     3.1   $ 13.5  
Share-based compensation, capitalized     0.5   1.8  
Unrecognized compensation cost related to unvested awards     25.0   $ 25.0  
Unrecognized compensation cost, period of recognition         2 years  
Value of shares granted (in usd per share) | $ / shares         $ 20.04  
Accelerated vesting compensation cost         $ 1.8  
Accelerated vesting (in shares) | shares         100,000  
Successor | Performance Share Units            
Share and Incentive Based Compensation Arrangement            
Share-based compensation expense     0.4   $ 1.0  
Share-based compensation, capitalized     $ 0.1   $ 0.2  
Common stock issuable per performance share | shares     1   1  
Successor | Performance Share Units | Maximum            
Share and Incentive Based Compensation Arrangement            
Shares granted | shares 400,000          
Predecessor | Restricted Stock            
Share and Incentive Based Compensation Arrangement            
Shares granted | shares           0
Vesting period           4 years
Share-based compensation expense       $ 1.8   $ 11.2
Share-based compensation, capitalized       $ 0.5   $ 1.7
Value of shares granted (in usd per share) | $ / shares           $ 0
Accelerated vesting compensation cost           $ 5.4
Accelerated vesting (in shares) | shares           1,300,000