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Partners' Capital Rollforward of non-controlling interest (Details) - USD ($)
1 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Temporary Equity [Line Items]          
Interest of non-controlling partner in subsidiary   $ 434,600,000 $ 432,700,000 $ 426,200,000 $ 0
Non-controlling interest reclassification (Note 12)       178,800,000  
Proceeds from Noncontrolling Interests $ 175,000,000 1,000,000.0 2,800,000 235,000,000.0  
Temporary Equity, Net Income   41,100,000 40,800,000 30,800,000  
Series A-3          
Temporary Equity [Line Items]          
Proceeds from Noncontrolling Interests       235,000,000.0  
Non-Controlling Partner          
Temporary Equity [Line Items]          
Proceeds from Noncontrolling Interests   1,000,000.0 2,800,000    
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders   $ (40,200,000) $ (37,100,000) $ (18,400,000)