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Related Party Transactions (CCI) (Narrative) (Details) - CCI [Member] - Immediate Family Member of Management [Member] - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Related Party Transaction [Line Items]        
Equity investment, ownership percentage 15.00%   15.00%  
Equipment [Member]        
Related Party Transaction [Line Items]        
Payments, related party $ 9.0 $ 22.9 $ 19.9 $ 34.9
Payables, related party 22.9   22.9  
Revenue, related party 0.3   0.3  
Receivables, related party $ 0.3   $ 0.3