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Net Earnings per Common Unit (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Basic earnings per common unit:                      
Net earnings $ 113.6 $ 72.7 $ 149.3 $ 166.8 $ 150.0 $ 131.8 $ 154.8 $ 124.2 $ 502.4 $ 560.8 $ 508.0
Less : Net earnings allocable to General Partner                 205.7 239.7 219.4
Weighted average units outstanding                 18.5 18.5 18.5
Net earnings per Common Unit (in dollars per unit) $ 3.73 $ 2.52 $ 4.54 $ 4.98 $ 4.61 $ 4.00 $ 4.67 $ 3.78 $ 15.77 $ 17.06 $ 15.33
Dilutive TNCLP units outstanding                 0 0 0
Class B Common Units
                     
Basic earnings per common unit:                      
Less : Net earnings allocated                 4.9 5.5 5.0
Common Units
                     
Basic earnings per common unit:                      
Less : Net earnings allocated                 $ 291.8 $ 315.6 $ 283.6