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Equity-based Awards (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Equity-based compensation expense [Abstract]        
Total compensation expense $ 21.8 $ 26.7 $ 44.2 $ 50.1
Equity-classified awards [Member] | Phantom Unit Awards [Member]        
Equity-based compensation expense [Abstract]        
Total compensation expense 19.3 22.7 38.7 39.9
Equity-classified awards [Member] | Restricted Common Unit Awards [Member]        
Equity-based compensation expense [Abstract]        
Total compensation expense 0.7 3.9 2.9 10.0
Equity-classified awards [Member] | Profits Interest Awards [Member]        
Equity-based compensation expense [Abstract]        
Total compensation expense 1.6 0.0 2.3 0.0
Liability-classified awards [Member]        
Equity-based compensation expense [Abstract]        
Total compensation expense $ 0.2 $ 0.1 $ 0.3 $ 0.2
Long-Term Incentive Plan (2008) [Member]        
Equity-based compensation expense [Abstract]        
Maximum number of common units that may be issued as awards (in units) 35,000,000   35,000,000  
Incremental number of units to be authorized annually (in units)     5,000,000  
Maximum number of additional units to be authorized for issuance (in units)     70,000,000  
Remaining number of common units available to be issued as awards (in units) 18,161,029   18,161,029  
Long Term Incentive Plan (1998) [Member]        
Equity-based compensation expense [Abstract]        
Maximum number of common units that may be issued as awards (in units) 14,000,000   14,000,000  
Remaining number of common units available to be issued as awards (in units) 3,251,373   3,251,373