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Related Party Transactions (Executive Officers) (Narrative) (Details)
$ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
employee
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Management [Member] | Subcontracting Arrangements [Member]      
Related Party Transaction [Line Items]      
Number of additional management employees, subcontracting arrangement | employee 2    
Payments or expenses, related party $ 0.7 $ 1.6  
Payables, related party 0.6   $ 0.2
Chairman, Board of Directors [Member] | Lease Agreements [Member]      
Related Party Transaction [Line Items]      
Payments or expenses, related party 0.6 0.7  
Executive Officers [Member] | Related Customer [Member]      
Related Party Transaction [Line Items]      
Receivables, related party 0.9   $ 0.8
Charges, related party 0.3 $ 0.4  
Executive Officers [Member] | Construction Services [Member]      
Related Party Transaction [Line Items]      
Payments or expenses, related party 0.2    
Revenue, related party 4.0    
Receivables, related party $ 3.6