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Redeemable Noncontrolling Interests - Table 1 (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Redeemable Noncontrolling Interest [Line Items]    
Balance at beginning of period $ 220.9  
Net income attributable to noncontrolling interests 2.8 $ 3.1
Distributions declared (17.7) (10.5)
Change in fair value (40.5) (8.2)
Balance at end of period 198.6  
Redeemable Noncontrolling Interest [Member]    
Redeemable Noncontrolling Interest [Line Items]    
Balance at beginning of period 220.9 138.3
Net income attributable to noncontrolling interests 2.8 3.1
Distributions declared (2.2) (1.9)
Purchase of redeemable noncontrolling interests (65.1) 0.0
Change in fair value 42.2 13.9
Balance at end of period $ 198.6 $ 153.4