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Affiliate Equity - Summary of Affiliate Equity-Recognized and Unrecognized Expense (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Affiliate Equity [Line Items]    
Non-controlling interests $ 3.9 $ 5.3
Affiliate equity expense $ 5.2 7.8
Minimum    
Unrecognized Affiliate Equity Expense [Abstract]    
Affiliate equity, conditional right to put interest (in years) 5 years  
Maximum    
Unrecognized Affiliate Equity Expense [Abstract]    
Affiliate equity, conditional right to put interest (in years) 15 years  
Noncontrolling Interest    
Affiliate Equity [Line Items]    
Affiliate equity expense $ 3.9 $ 5.3
Unrecognized Affiliate Equity Expense [Abstract]    
Remaining Life (in years) 6 years 5 years
Non-Controlling Interest $ 62.9 $ 51.9
Affiliated Entity    
Affiliate Equity [Line Items]    
Controlling interest 2.1 4.0
Tax benefit (0.8) (1.5)
Controlling interest, net 1.3 2.5
Unrecognized Affiliate Equity Expense [Abstract]    
Controlling Interest $ 30.4 $ 22.4
Remaining Life (in years) 4 years 3 years