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Equity-Based Awards (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Equity-based compensation expense [Abstract]      
Total compensation expense $ 93.2 $ 87.5 $ 72.8
Equity-classified awards [Member] | Restricted Common Unit Awards [Member]      
Equity-based compensation expense [Abstract]      
Total compensation expense 14.7 42.1 71.5
Equity-classified awards [Member] | Phantom Unit Awards [Member]      
Equity-based compensation expense [Abstract]      
Total compensation expense 78.3 45.1 0.0
Equity-classified awards [Member] | Unit Option Awards [Member]      
Equity-based compensation expense [Abstract]      
Total compensation expense 0.0 0.0 0.8
Liability-classified awards [Member]      
Equity-based compensation expense [Abstract]      
Total compensation expense $ 0.2 $ 0.3 $ 0.5
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    
Remaining number of common units available to be issued as awards (in units) 3,073,703    
Long-Term Incentive Plan (2008) [Member]      
Equity-based compensation expense [Abstract]      
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    
Maximum number of common units that may be issued as awards (in units) 30,000,000    
Remaining number of common units available to be issued as awards (in units) 16,669,007