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Share-Based Payments - Textual (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average fair value per share (in dollars per share) $ 11.55 $ 15.11 $ 11.41
Unrecognized compensation cost $ 1.1    
Intrinsic value of stock options exercised $ 9.1 $ 4.2 $ 2.4
2008 Amended and Restated Equity Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares authorized for grant under the Plan (shares) 9,000,000 9,000,000 9,000,000
2016 Omnibus Performance Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares authorized for grant under the Plan (shares) 14,000,000    
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration period 10 years    
Vesting period 3 years    
Share-based compensation expense $ 1.6 $ 1.6 $ 1.9
Weighted-average recognition period for unrecognized compensation cost 26 months    
Employment Based SARS [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares granted during the period (shares) 122,976    
Stock Appreciation Rights (SARs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 5.8 $ 3.5  
Weighted-average recognition period for unrecognized compensation cost 63 months    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options $ 11.4    
Weighted-average fair value per share of awards granted (in dollars per share) $ 84.33 $ 64.09  
Outstanding awards (shares) 252,100    
Performance and Employment Based SARS [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares granted during the period (shares) 129,124    
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ 18.7 $ 19.5 $ 20.8
Weighted-average recognition period for unrecognized compensation cost 21 months    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options $ 18.6    
Weighted-average fair value per share of awards granted (in dollars per share) $ 33.56 $ 27.86 $ 23.94
Fair value of vested shares $ 24.3 $ 41.0 $ 25.9
Awards issued during period (shares) 542,000    
Non-employee Directors [Member] | Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average fair value per share of awards granted (in dollars per share) $ 40.75 $ 42.46 $ 33.02
Outstanding awards (shares) 434,134    
Awards issued during period (shares) 32,031 30,744 36,350
Compensation expense recognized $ 1.3 $ 1.3 $ 1.2
Unrecognized compensation cost $ 0.0    
Non-employee Directors [Member] | Dividend Equivalent, RSU [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards issued during period (shares) 10,248 7,645 8,149