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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, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Equity-based compensation expense [Abstract]        
Total compensation expense $ 22.8 $ 18.6 $ 40.3 $ 35.8
Equity-classified awards [Member] | Restricted Common Unit Awards [Member]
       
Equity-based compensation expense [Abstract]        
Total compensation expense 9.0 18.3 20.6 34.9
Equity-classified awards [Member] | Unit Option Awards [Member]
       
Equity-based compensation expense [Abstract]        
Total compensation expense 0 0.2 0 0.6
Equity-classified awards [Member] | Phantom Unit Awards [Member]
       
Equity-based compensation expense [Abstract]        
Total compensation expense 13.6 0 19.4 0
Liability-classified awards [Member]
       
Equity-based compensation expense [Abstract]        
Total compensation expense $ 0.2 $ 0.1 $ 0.3 $ 0.3
Long-Term Incentive Plan (2008) [Member]
       
Equity-based compensation expense [Abstract]        
Maximum number of common units that may be issued as awards (in units) 12,500,000   12,500,000  
Incremental number of units to be authorized annually (in units)     2,500,000  
Maximum number of additional units to be authorized for issuance (in units)     35,000,000  
Remaining number of common units available to be issued as awards (in units) 6,388,498   6,388,498  
Long Term Incentive Plan (1998) [Member]
       
Equity-based compensation expense [Abstract]        
Maximum number of common units that may be issued as awards (in units) 7,000,000   7,000,000  
Remaining number of common units available to be issued as awards (in units) 1,340,885   1,340,885