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Related Party Transactions (Contractual Joint Venture) (Narrative) (Details) - Joint Venture [Member] - Pacer [Member]
$ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2018
CAD ($)
Dec. 31, 2017
CAD ($)
Related Party Transaction [Line Items]          
Proportionately consolidated non-controlled joint venture, ownership percentage 35.00%     35.00%  
Performance Guarantees [Member]          
Related Party Transaction [Line Items]          
Guarantees issued, related party       $ 26.4 $ 132.1
Canadian Dollars [Member]          
Related Party Transaction [Line Items]          
Revenue, related party $ 0.6 $ 1.5 $ 1.0    
Accounts receivable, net of BIEC, related parties   0.8      
Financing or amounts advanced, related party 2.7 7.2 $ 6.8    
Canadian Dollars [Member] | Performance Guarantees [Member]          
Related Party Transaction [Line Items]          
Guarantees issued, related party $ 19.4 $ 105.1