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Related Party Transactions (Management) (Narrative) (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
subsidiary
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Management [Member] | Equipment, Supplies and Services [Member]          
Related Party Transaction [Line Items]          
Payments, related party $ 25.5 $ 34.2 $ 71.8 $ 65.9  
Payables, related party 20.3   20.3   $ 17.3
Revenue, related party 0.7 3.2 1.6 9.4  
Receivables, net, related party $ 0.1   $ 0.1   0.3
Management [Member] | Acquisition of Non-Controlling Interest [Member]          
Related Party Transaction [Line Items]          
Number of subsidiaries | subsidiary     1    
CCI [Member] | Immediate Family Member of Management [Member]          
Related Party Transaction [Line Items]          
Equity investment, ownership percentage 15.00%   15.00%    
CCI [Member] | Immediate Family Member of Management [Member] | Equipment [Member]          
Related Party Transaction [Line Items]          
Payments, net of rebates, related party $ 7.7 $ 9.0 $ 23.6 $ 19.9  
Payables, related party $ 12.3   $ 12.3   $ 4.9