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Redeemable Noncontrolling Interests - Table 1 (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Redeemable Noncontrolling Interest [Line Items]        
Balance at beginning of period     $ 138.3  
Net income attributable to noncontrolling interests $ 4.2 $ 3.7 9.9 $ 11.2
Distributions declared     (37.1) (43.1)
Change in fair value     (44.4) 10.2
Balance at end of period 221.3   221.3  
Redeemable Noncontrolling Interest [Member]        
Redeemable Noncontrolling Interest [Line Items]        
Balance at beginning of period     138.3 121.1
Net income attributable to noncontrolling interests     9.9 11.2
Distributions declared     (3.3) (6.4)
Contribution to joint venture     2.3 0.0
Change in fair value     74.1 (16.5)
Balance at end of period $ 221.3 $ 109.4 $ 221.3 $ 109.4