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Equity-based Awards (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Equity-based compensation expense [Abstract]        
Total compensation expense $ 18.6 $ 16.5 $ 35.8 $ 32.9
Restricted Common Unit Awards [Member]
       
Equity-based compensation expense [Abstract]        
Total compensation expense 18.3 15.7 34.9 30.5
Unit Option Awards [Member]
       
Equity-based compensation expense [Abstract]        
Total compensation expense 0.2 0.3 0.6 1.0
Other Equity-based Awards [Member]
       
Equity-based compensation expense [Abstract]        
Total compensation expense $ 0.1 [1] $ 0.5 [1] $ 0.3 [1] $ 1.4 [1]
Long-Term Incentive Plan (1998) [Member]
       
Equity-based compensation expense [Abstract]        
Remaining number of common units available to be issued as awards (in units) 1,155,077   1,155,077  
Long-Term Incentive Plan (2008) [Member]
       
Equity-based compensation expense [Abstract]        
Remaining number of common units available to be issued as awards (in units) 4,307,512   4,307,512  
[1] Primarily represents expense associated with unit appreciation rights ("UARs"), phantom units and similar awards.