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Shareholders' Deficit - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2016
Nov. 30, 2015
Nov. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Preference stock, shares authorized (in shares) 15,000,000.0 15,000,000.0    
Preference stock, shares issued (in shares) 0 0    
Preference stock, shares outstanding (in shares) 0 0    
Common stock, shares authorized (in shares) 150,000,000.0 150,000,000.0    
Common stock, par value (in USD per share) $ 0.10 $ 0.10    
Common stock, shares issued (in shares) 62,900,000 69,200,000    
Common stock, shares outstanding (in shares) 62,900,000 69,200,000    
Number of shares reserved for future issuance   32,100,000    
Purchase of treasury stock       $ 64.5
Stock granted in period (in shares)   200,000    
Expected volatility, Minimum   32.00%    
Expected volatility, Maximum   45.00%    
Risk-free interest rate, Minimum   0.66%    
Risk-free interest rate, Maximum   2.24%    
Common Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of common shares repurchased (in shares)   3,500,000   3,500,000
Purchase of treasury stock   $ 64.5    
Retirement Savings Plan Contributions [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise stock options contractual life   7 years    
Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise stock options contractual life   10 years    
Stock outstanding (in shares) 600,000 600,000 600,000  
Weighted average grant date fair value of restricted stock granted (in USD per share)     $ 23.04 $ 10.33
Intrinsic value for options exercised   $ 2.1 $ 3.9 $ 0.5
Performance Based, Common Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted Stock, Granted (in shares)   200,000    
Total stock-based compensation not yet recognized   $ 1.6    
Recognition period for compensation Cost   7 months    
Weighted average grant date fair value of restricted stock granted (in USD per share)   $ 12.99    
Performance Based, Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted-average grant date fair value of SARS granted (in USD per share)   $ 5.81    
Stock granted in period (in shares)   200,000    
Intrinsic value of restricted stock which is expected to vest   $ 3.6    
SARS [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock outstanding (in shares) 800,000 1,000,000 800,000  
Weighted-average grant date fair value of SARS granted (in USD per share)   $ 7.66    
Stock granted in period (in shares) 0 500,000 0 0
Intrinsic value paid   $ 2.3 $ 3.3 $ 1.0
Total stock-based compensation not yet recognized   $ 2.6    
Recognition period for compensation Cost   25 months    
SARS [Member] | Employees [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting rate   33.30%    
SARS [Member] | Director [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting rate   50.00%    
SARS [Member] | 1999 Plan [Member] | Employees [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise stock options contractual life   10 years    
SARS [Member] | 1999 Plan [Member] | Director [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise stock options contractual life   10 years    
SARS [Member] | 2009 Plan [Member] | Employees [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise stock options contractual life   7 years    
SARS [Member] | 2009 Plan [Member] | Director [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Exercise stock options contractual life   7 years    
Restricted Stock, Service-Based [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted Stock, Granted (in shares)   400,000    
Recognition period for compensation Cost   20 months    
Restricted stock outstanding (in shares) 500,000 600,000 500,000  
Unrecognized compensation cost related to restricted stock   $ 6.4    
Intrinsic value of restricted stock outstanding   10.6    
Intrinsic value of restricted stock which is expected to vest   $ 10.2    
Weighted average grant date fair value of restricted stock granted (in USD per share)   $ 17.65 $ 20.70 $ 17.22
Performance-Based Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted Stock, Granted (in shares)   500,000    
Recognition period for compensation Cost   14 months    
Restricted stock outstanding (in shares) 1,000,000 1,100,000 1,000,000  
Unrecognized compensation cost related to restricted stock   $ 5.6    
Intrinsic value of restricted stock outstanding   19.9    
Intrinsic value of restricted stock which is expected to vest   $ 11.6    
Weighted average grant date fair value of restricted stock granted (in USD per share)   $ 15.97 $ 21.33 $ 17.25
Performance-Based Restricted Stock [Member] | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share price (in USD per share)   22.00    
Performance-Based Restricted Stock [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share price (in USD per share)   $ 27.00    
Employee Stock Purchase Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock purchase price, percentage of fair value on last day of respective offering period (not less than)   85.00%    
Shares issued in period (in shares) 100,000 200,000 100,000  
Average price of shares issued in period (in USD per share) $ 15.66 $ 18.11 $ 20.61  
Employee Stock Purchase Plan [Member] | 2009 Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share authorized for issuance (in shares)   1,500,000.0