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Equity Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
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 $ 0.4 $ 4.6
Share-based Payment Arrangement, Exercise of Option, Tax Benefit   $ 1.1
Document Fiscal Year Focus 2019  
Unvested and restricted share awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 27.4  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 2 years 3 months 18 days  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 590,572 652,685
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 36.50 $ 40.33
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 60,290  
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, Award Vesting Period 3 years  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 73,062 52,026
RSU and PSU Awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 6.3  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 2 years 2 months 4 days  
Deferred Compensation Share-based Arrangements, Liability, Current and Noncurrent $ 5.0  
Incentive Compensation Arrangements [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 3.4  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 4 years 3 months 3 days  
Deferred Compensation Share-based Arrangements, Liability, Current and Noncurrent $ 0.6