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Stock-Based Compensation - Narrative (Details)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
Y
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Dec. 31, 2013
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense (in dollars) | $ $ 12.2 $ 12.6 $ 14.9    
Number of share options granted during the period (in shares) | shares     700,000 300,000  
Exercise Price, low end of range (in dollars per share) | $ / shares     $ 4.41    
Exercise Price, high end of range (in dollars per share) | $ / shares     $ 47.84    
Period of U.S. Treasury rates as a basis for assumed risk-free rates (in years) | Y     10    
2013 Omnibus Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares of common stock authorized under the plan (shares) | shares 8,000,000   8,000,000    
Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense (in dollars) | $     $ 4.4 $ 5.7 $ 6.3
Number of share options granted during the period (in shares) | shares     700,000 300,000 400,000
Stock-based compensation expense, net of tax (in dollars) | $     $ 2.8 $ 3.6 $ 4.0
Unrecognized compensation expense (in dollars) | $ $ 4.5   $ 4.5    
Recognition period for unrecognized compensation expense (in years)     2 years 10 months 24 days    
Weighted average grant date fair value, options (in dollars per share) | $ / shares     $ 10.93 $ 14.84 $ 9.00
Total intrinsic value of stock options exercised | $     $ 5.6 $ 28.5 $ 6.9
Stock Options | Directors          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting rights, annual increments beginning on the grant date     0.25    
Vesting period (in years)     4 years    
Expiration period     10 years    
Anniversary period from grant date, for grants made prior to 2011 (in years)     1 year    
Stock Options | Officers and Employees          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting rights, annual increments beginning on the grant date     25% increments beginning on the first anniversary of the grant date    
Vesting period (in years)     4 years    
Vesting rights percentage for grants made prior to 2011 (as a percent)     25.00%    
Expiration period for grants made prior to 2011 (in years)     10 years    
Anniversary period from grant date, for grants made prior to 2011 (in years)     2 years    
Stock Options | Stock Plan 2003 | Officers and Employees          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options vesting percentage     25.00%    
Vesting rights, annual increments beginning on the grant date     25% increments beginning on the second anniversary of the grant date    
Vesting period (in years)     4 years    
Expiration period     10 years    
Anniversary period from grant date (in years)     2 years    
Stock Options | Director Stock Plan 2004 | Directors          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expiration period     10 years    
Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expiration period     3 years    
Stock-based compensation expense (in dollars) | $     $ 0.3 1.0 2.8
Stock-based compensation expense, net of tax (in dollars) | $     $ 0.2 $ 0.6 $ 1.8
Granted (in shares) | shares     400,000 0 100,000
Restricted Stock | Stock Plan 2003 | Officers and Employees          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Options vesting percentage     100.00%    
Vesting rights, annual increments beginning on the grant date     100% on the third anniversary of the grant date    
Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense (in dollars) | $     $ 7.5 $ 5.9 $ 5.8
Stock-based compensation expense, net of tax (in dollars) | $     4.7 $ 3.8 $ 3.6
Unrecognized compensation expense (in dollars) | $ $ 6.4   $ 6.4    
Recognition period for unrecognized compensation expense (in years)     1 year 9 months    
Granted (in shares) | shares     600,000 400,000 500,000
Performance shares          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense (in dollars) | $     $ 7.5 $ 5.9 $ 5.8
Granted (in shares) | shares     600,000    
Performance shares | Performance Shares 2014 | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted (in shares) | shares     0    
Performance shares | Performance Shares 2014 | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted (in shares) | shares     500,000    
Performance shares | Performance Shares 2013          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Percentage of shares paid based on total shareholder return relative to peer group of companies     50.00%    
Percentage of shares paid based on improvement in total leverage ratio     50.00%    
Performance shares | Performance Shares 2012          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Period for meeting performance goals (in years)     3 years    
Percent of target (as a percent)     78.60%    
Total performance shares awarded | shares     300,000    
Performance shares | Performance Shares 2012 | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted (in shares) | shares     0    
Performance shares | Performance Shares 2012 | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted (in shares) | shares     800,000    
Separation Expense | Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense (in dollars) | $     $ 2.2    
Granted (in shares) | shares     100,000