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Net Earnings per Common Unit (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Net earnings per limited partner common unit    
Net earnings $ 42.2 $ 37.7
Weighted-average common units outstanding 18,500,000 18,500,000
Net earnings per Common Unit (in dollars per unit) $ 2.10 $ 1.44
Dilutive TNCLP units outstanding 0 0
General Partner    
Net earnings per limited partner common unit    
Net earnings $ 3.0 $ 10.6
Less: Net earnings allocable to General Partner 3.0 10.6
Common Units | Class B Common Units    
Net earnings per limited partner common unit    
Net earnings 0.4 0.4
Net earnings allocated 0.4 0.4
Common Units | Common Units    
Net earnings per limited partner common unit    
Net earnings 38.8 26.7
Net earnings allocated $ 38.8 $ 26.7