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Share-Based Payments - Textual (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation (Textual) [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value $ 2.3 $ 7.4 $ 8.2
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weighted Average Volatility Rate 39.50% 40.30% 41.80%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate 1.90% 2.20% 1.40%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 7 years 8 months 12 days 7 years 2 months 7 years 2 months
2008 Amended and Restated Equity Incentive Plan [Member]      
Share-based Compensation (Textual) [Abstract]      
Share-based Compensation Plan, Shares Authorized 9,000,000 9,000,000 9,000,000
Stock Options [Member]      
Share-based Compensation (Textual) [Abstract]      
Share-based Compensation, Options, Grants in Period, Weighted-Average Fair Value $ 15.11 $ 11.41 $ 10.96
Share-based Compensation Expense $ 1.6 $ 1.9 $ 2.1
Share-based Compensation, Unrecognized Expense $ 1.8    
Share-based Compensation, Unrecognized Expense, Time Period Expected to be Recognized 21 months    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value $ 4.2 2.4 1.9
Stock Appreciation Rights (SARs) [Member]      
Share-based Compensation (Textual) [Abstract]      
Share-based Compensation, Options, Grants in Period, Weighted-Average Fair Value $ 64.09    
Share-based Compensation Expense $ 3.5    
Share-based Compensation, Unrecognized Expense $ 12.2    
Share-based Compensation, Unrecognized Expense, Time Period Expected to be Recognized 6 years 3 months    
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 122,976    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 129,124    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weighted Average Volatility Rate 30.70%    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate 2.10%    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 6 years 3 months 18 days    
Share-based Compensation Plan, Number of Shares Available for Grant 252,100    
Restricted Stock [Member]      
Share-based Compensation (Textual) [Abstract]      
Share-based Compensation Expense $ 19.5 $ 20.8 $ 21.6
Share-based Compensation, Unrecognized Expense $ 16.2    
Share-based Compensation, Unrecognized Expense, Time Period Expected to be Recognized 21 months    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 842,000 1,197,000  
Share-based Compensation, Restricted Stock Awards, Grants in Period, Weighted Average Fair Value $ 27.86 $ 23.94 $ 23.55
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value $ 41.0 $ 25.9 $ 15.7
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation (Textual) [Abstract]      
Share-based Compensation Expense 1.3 $ 1.2 $ 1.2
Share-based Compensation, Unrecognized Expense $ 0.0    
Share-based Compensation Plan, Restricted Stock Units, Issued in Period 30,744 36,350 51,180
Share-based Compensation Plan, Restricted Stock Units, Issued in Period, Weighted Average Grant Date Fair Value $ 42.46 $ 33.02 $ 22.47
Share-based Compensation Plan, Restricted Stock Units As Dividend Equivalents, Issued in Period 7,645 8,149 1,831
Share-based Compensation Plan, Number of Shares Available for Grant 391,855