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Related Party Transactions (Contractual Joint Venture) (Narrative) (Details) - Joint Venture [Member] - Pacer [Member]
$ in Millions, $ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Mar. 31, 2019
CAD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CAD ($)
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     $ 26.4   $ 26.4
Canadian Dollars [Member]          
Related Party Transaction [Line Items]          
Revenue, related party $ 0.0 $ 0.3      
Financing or amounts advanced, related party 0.0 $ 0.6      
Canadian Dollars [Member] | Performance Guarantee [Member]          
Related Party Transaction [Line Items]          
Guarantees issued, related party $ 19.8     $ 19.4