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Affiliated Equity (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Affiliate Equity [Line Items]      
Distributions paid to affiliate partners $ 189.0 $ 230.0  
Payments to acquire interest in affiliates 75.3 31.1  
Issuance of interest in affiliates 3.6 $ 6.0  
Other Assets      
Affiliate Equity [Line Items]      
Due from affiliates 16.9   $ 22.6
Other Liabilities      
Affiliate Equity [Line Items]      
Due to affiliates $ 27.0   $ 62.3