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Stock-Based Compensation (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Apr. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Mar. 20, 2016
May 07, 2013
Stock-Based Compensation              
Stock-based compensation expense (in dollars)   $ 1.0 $ 2.6 $ 3.8 $ 8.4    
Stock Options              
Stock-Based Compensation              
Number of share options granted during the period (in shares)       1,800,000 500,000    
Restricted Stock Units (RSUs)              
Stock-Based Compensation              
Number of shares of other than options granted during the period (in shares)       1,400,000 400,000    
Restricted Stock              
Stock-Based Compensation              
Number of shares of other than options granted during the period (in shares) 400,000     300,000      
Restricted Stock | Officers and Employees              
Stock-Based Compensation              
Expiration period of restrictions (in years)       3 years      
Restricted Stock | Director              
Stock-Based Compensation              
Expiration period of restrictions (in years)       2 years      
2013 Omnibus Plan              
Stock-Based Compensation              
Share-based compensation, shares authorized (in shares)             8,000,000
Shares available for future grant (in shares)           28,184,595  
Performance Shares 2016 | Performance Shares              
Stock-Based Compensation              
Percentage of shares paid based on total shareholder return relative to peer group (as a percent)       50.00%      
Percentage of shares paid based on improvement in total leverage ratio       50.00%      
Period for meeting performance goals       3 years      
Performance Shares 2016 | Minimum | Performance Shares              
Stock-Based Compensation              
Number of shares of other than options granted during the period (in shares)       0      
Performance Shares 2016 | Maximum | Performance Shares              
Stock-Based Compensation              
Number of shares of other than options granted during the period (in shares)       1,300,000.0      
Performance Shares 2014 | Minimum | Performance Shares              
Stock-Based Compensation              
Number of shares of other than options granted during the period (in shares)       0      
Performance Shares 2014 | Maximum | Performance Shares              
Stock-Based Compensation              
Number of shares of other than options granted during the period (in shares)       100,000.0