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Partners' Capital Rollforward of non-controlling interest (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Increase (Decrease) in Temporary Equity [Roll Forward]      
Temporary Equity, Net Income $ 9.9    
Interest of non-controlling partner in subsidiary 426.9   $ 426.2
Non-Controlling Partners      
Increase (Decrease) in Temporary Equity [Roll Forward]      
Partners' Capital Account, Distributions   $ (3.3)  
Non-Controlling Partners      
Increase (Decrease) in Temporary Equity [Roll Forward]      
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders $ (9.2)