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Equity-Based Awards (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Equity-based compensation expense [Abstract]      
Total compensation expense $ 106.1 $ 99.7 $ 89.2
Phantom Unit Awards [Member]      
Equity-based compensation expense [Abstract]      
Total compensation expense 99.7 92.8 78.6
Restricted Common Unit Awards [Member]      
Equity-based compensation expense [Abstract]      
Total compensation expense 0.0 0.5 4.7
Profits Interest Awards [Member]      
Equity-based compensation expense [Abstract]      
Total compensation expense 6.1 6.0 5.4
Liability-classified awards [Member]      
Equity-based compensation expense [Abstract]      
Total compensation expense $ 0.3 $ 0.4 $ 0.5
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) 45,000,000    
Remaining number of common units available to be issued as awards (in units) 19,116,132