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Incentive Plan (Schedule of Compensation Expense) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Granted (shares) 98,470    
Long-term incentive units      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Deferred compensation, expensed $ 3.1 $ 1.4  
Deferred compensation, capitalized 0.1    
Unearned Compensation $ 24.7   $ 15.4
Expected period to recognize unearned compensation (in years) 2 years 6 months    
Granted (shares) 76,044    
Vested (shares) 70,406    
Long-term incentive units | Minimum      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Award vesting period 2 years    
Long-term incentive units | Maximum      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Award vesting period 4 years    
Performance-based awards      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Deferred compensation, expensed $ 4.7 3.1  
Deferred compensation, capitalized 0.2 0.2  
Unearned Compensation $ 41.4   28.4
Expected period to recognize unearned compensation (in years) 3 years    
Performance-based awards | Minimum      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Award vesting period 2 years    
Performance-based awards | Maximum      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Award vesting period 3 years    
Restricted stock      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Deferred compensation, expensed $ 3.2 2.6  
Deferred compensation, capitalized 0.8 $ 0.6  
Unearned Compensation $ 50.0   $ 29.1
Expected period to recognize unearned compensation (in years) 3 years 1 month 6 days    
Granted (shares) 759,342    
Vested (shares) 122,683    
Restricted stock | Maximum      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Award vesting period 4 years    
Interxion awards      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Deferred compensation, expensed $ 3.0    
Unearned Compensation $ 47.5    
Expected period to recognize unearned compensation (in years) 2 years 8 months 12 days    
Granted (shares) 567,810    
Performance based class d units and rsu      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Granted (shares) 64,709    
Profits interest units and RSU      
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]      
Granted (shares) 25,635