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Equity Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
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 $ 22.9    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 2 years 2 months 23 days    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period - Granted before 2019 3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 591,739 683,137 621,806
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value $ 36.49 $ 40.06 $ 40.24
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    
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 $ 5.9    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 2 years 1 month 17 days    
Deferred Compensation Share-based Arrangements, Liability, Current and Noncurrent $ 6.4    
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 $ 2.8    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 4 years    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period - Granted before 2019 3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years    
Deferred Compensation Share-based Arrangements, Liability, Current and Noncurrent $ 0.7    
2010 Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 7,500,000    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 118,847    
2014 Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 4,000,000    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 1,612,961    
Deferred Compensation Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Deferred Compensation Arrangement with Individual, Compensation Expense $ 1.9 $ 1.3 $ 1.5
Deferred Compensation Plan [Member] | Other Liabilities      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Deferred Compensation Liability, Current and Noncurrent $ 27.0 24.0  
401(k) Plan, First 1% Of Eligible Compensation [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Deferred Compensation Arrangement with Individual, Cash Awards Granted, Percentage 100.00%    
401(k) Plan, 2% To 6% Of Eligible Compensation [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Deferred Compensation Arrangement with Individual, Cash Awards Granted, Percentage 70.00%    
401(k) Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Deferred Compensation Arrangement with Individual, Contributions by Employer $ 6.1 $ 6.3 $ 5.5