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Equity Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value $ 25.3  
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options (Deprecated 2017-01-31) $ 3.8  
Unvested and restricted share awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 618,306 644,888
Stock Granted, Value, Share-based Compensation, Gross $ 24.9 $ 20.0
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years 3 years
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 26.7  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 1 year 11 months 24 days  
Restricted Stock Units (RSUs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 47,848 57,873
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years  
Employee Service Share-based Compensation, Cash Flow Effect, Cash Used to Settle Awards $ 0.8  
Performance Shares [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 47,848 57,873
RSU and PSU Awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 5.3  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 2 years 2 months 4 days  
Deferred Compensation Share-based Arrangements, Liability, Current and Noncurrent $ 2.6  
Liability based awards settled in shares [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 25,321  
Incentive Compensation Arrangements [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 5.3  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 3 years 2 months 29 days  
Deferred Compensation Share-based Arrangements, Liability, Current and Noncurrent $ 1.2  
Minimum | Unvested and restricted share awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 33.21 $ 29.78
Maximum [Member] | Unvested and restricted share awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 40.84 $ 33.76