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Affiliate Equity - Summary of Affiliate Recognized and Unrecognized Expense (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Affiliate Equity [Line Items]      
Affiliate equity expense $ 10.7 $ 19.4  
Non- controlling Interests      
Affiliate Equity [Line Items]      
Non-controlling interests $ 8.5 16.8  
Unrecognized Affiliate Equity Expense [Abstract]      
Remaining Life 6 years   6 years
Non-controlling Interests $ 123.4   $ 118.3
Affiliated Entity      
Affiliate Equity [Line Items]      
Controlling interest 2.2 $ 2.6  
Unrecognized Affiliate Equity Expense [Abstract]      
Controlling Interest $ 41.0   $ 38.7
Remaining Life 5 years   5 years