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Redeemable Noncontrolling Interests - Table 1 (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Redeemable Noncontrolling Interest [Line Items]        
Balance at beginning of period     $ 138.3  
Net income attributable to noncontrolling interests $ 2.6 $ 3.6 5.7 $ 7.5
Distributions declared     (22.9) (29.9)
Change in fair value     (45.1) 2.8
Balance at end of period 216.0   216.0  
Redeemable Noncontrolling Interest [Member]        
Redeemable Noncontrolling Interest [Line Items]        
Balance at beginning of period     138.3 121.1
Net income attributable to noncontrolling interests     5.7 7.5
Distributions declared     (3.1) (4.3)
Change in fair value     75.1 (4.3)
Balance at end of period $ 216.0 $ 120.0 $ 216.0 $ 120.0