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Equity-Based Awards (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Equity-based compensation expense [Abstract]        
Total compensation expense $ 27.0 $ 25.1 $ 53.3 $ 50.1
Phantom Unit Awards [Member]        
Equity-based compensation expense [Abstract]        
Total compensation expense 25.9 23.5 50.5 46.3
Restricted Common Unit Awards [Member]        
Equity-based compensation expense [Abstract]        
Total compensation expense 0.0 0.0 0.0 0.5
Profits Interest Awards [Member]        
Equity-based compensation expense [Abstract]        
Total compensation expense 1.0 1.6 2.6 3.1
Liability-classified awards [Member]        
Equity-based compensation expense [Abstract]        
Total compensation expense $ 0.1 $ 0.0 $ 0.2 $ 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) 45,000,000   45,000,000  
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) 18,864,940   18,864,940