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Partners' Capital Rollforward of non-controlling interest (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Apr. 09, 2019
Temporary Equity [Line Items]          
Interest of non-controlling partner in subsidiary   $ 426.2     $ 0.0
Non-controlling interest reclassification (Note 12)   178.8      
Proceeds from Noncontrolling Interests $ 175.0 235.0 $ 0.0 $ 175.0  
Temporary Equity, Net Income   30.8      
Series A-3          
Temporary Equity [Line Items]          
Proceeds from Noncontrolling Interests   235.0      
Non-Controlling Partner          
Temporary Equity [Line Items]          
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders   $ (18.4)