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Redeemable Noncontrolling Interests - Table 1 (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Redeemable Noncontrolling Interest [Line Items]        
Balance at beginning of period     $ 220.9  
Net income attributable to noncontrolling interests $ 3.7 $ 2.6 6.5 $ 5.7
Distributions declared     (36.8) (22.9)
Change in fair value     (58.2) (45.1)
Balance at end of period 223.9   223.9  
Redeemable Noncontrolling Interest [Member]        
Redeemable Noncontrolling Interest [Line Items]        
Balance at beginning of period     220.9 138.3
Net income attributable to noncontrolling interests     6.5 5.7
Distributions declared     (4.6) (3.1)
Purchase of redeemable noncontrolling interests     (65.1) 0.0
Change in fair value     66.2 75.1
Balance at end of period $ 223.9 $ 216.0 $ 223.9 $ 216.0