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Affiliate Equity Affiliated Equity (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Affiliate Equity [Line Items]      
Distributions paid to affiliate partners $ 101.6 $ 114.6  
Payments to acquire interest in affiliates 57.0 18.1  
Issuance of interest in affiliates 2.9 $ 5.0  
Other Assets      
Affiliate Equity [Line Items]      
Due from affiliates 17.2   $ 22.6
Other Liabilities      
Affiliate Equity [Line Items]      
Due to affiliates $ 35.6   $ 62.3