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Related Party Transactions (Contractual Joint Venture) (Narrative) (Details) - Joint Venture [Member] - Pacer [Member]
$ in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2018
CAD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2017
CAD ($)
Dec. 31, 2017
USD ($)
Related Party Transaction [Line Items]                
Proportionately consolidated non-controlled joint venture, ownership percentage         35.00% 35.00%    
Performance Guarantee [Member]                
Related Party Transaction [Line Items]                
Guarantees issued, related party         $ 132.1   $ 132.1  
Canadian Dollars [Member]                
Related Party Transaction [Line Items]                
Revenue, related party $ 0.2 $ 0.6 $ 0.6 $ 0.9        
Accounts receivable, net of BIEC, related party           $ 0.1   $ 0.8
Financing or amounts advanced, related party $ 0.6 $ 2.7 $ 2.7 $ 5.9        
Canadian Dollars [Member] | Performance Guarantee [Member]                
Related Party Transaction [Line Items]                
Guarantees issued, related party           $ 102.3   $ 105.1