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Affiliate Equity (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Affiliate Equity        
Distributions paid to affiliate partners   $ 431.4 $ 569.4 $ 267.1
Payments to acquire interest in Affiliates   130.8 32.6 36.9
Issuance of interest in Affiliates   6.1 11.0 2.5
Proceeds from Collection of Advance to Affiliate   7.4 9.7 6.9
Total amount paid to affiliates   17.2 4.4 $ 5.5
Other Assets        
Affiliate Equity        
Due from Affiliates   22.6 20.8  
Other Liabilities        
Affiliate Equity        
Due to Affiliates   $ 62.3 $ 29.3  
Minimum        
Affiliate Equity        
Affiliate equity, conditional right to put interest, period 5 years      
Maximum        
Affiliate Equity        
Affiliate equity, conditional right to put interest, period 15 years