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Redeemable Noncontrolling Interests - Table 1 (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Redeemable Noncontrolling Interest [Line Items]      
Balance at beginning of period $ 138.3    
Net income attributable to noncontrolling interests 17.9 $ 14.1 $ 13.8
Distributions (50.5) (54.2) (49.0)
Change in fair value (41.0) (6.7) (18.2)
Balance at end of period 220.9 138.3  
Redeemable Noncontrolling Interest [Member]      
Redeemable Noncontrolling Interest [Line Items]      
Balance at beginning of period 138.3 121.1 84.7
Net income attributable to noncontrolling interests 17.9 14.1 13.8
Distributions (4.6) (7.8) (7.3)
Contribution to joint venture 2.3 0.0 0.0
Change in fair value 67.0 10.9 29.9
Balance at end of period $ 220.9 $ 138.3 $ 121.1