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Affiliated Equity (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Affiliate Equity [Line Items]      
Distributions paid to affiliate partners $ 270.1 $ 336.9  
Payments to acquire interest in affiliates 82.1 91.7  
Issuance of interest in affiliates 11.8 $ 6.0  
Other Assets      
Affiliate Equity [Line Items]      
Due from affiliates 20.2   $ 22.6
Other Liabilities      
Affiliate Equity [Line Items]      
Due to affiliates $ 26.7   $ 62.3