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Redeemable Noncontrolling Interests - Table 1 (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Redeemable Noncontrolling Interest [Line Items]    
Balance at beginning of period $ 261.7  
Net income attributable to noncontrolling interests 4.0 $ 2.8
Distributions declared (15.3) (17.7)
Reclassification to noncontrolling interests 11.2 0.0
Change in fair value (20.3) (42.2)
Balance at end of period 273.0  
Redeemable Noncontrolling Interest [Member]    
Redeemable Noncontrolling Interest [Line Items]    
Balance at beginning of period 261.7 220.9
Net income attributable to noncontrolling interests 4.0 2.8
Distributions declared (1.8) (2.2)
Purchase of redeemable noncontrolling interests 0.0 (65.1)
Change in fair value 20.3 42.2
Balance at end of period $ 273.0 $ 198.6