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Redeemable Noncontrolling Interests - Redeemable Noncontrolling Interests Activity (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Redeemable Noncontrolling Interest, Equity, Carrying Amount [Roll Forward]        
Balance at beginning of period     $ 31.6  
Net income attributable to noncontrolling interests $ 2.7 $ 1.5 5.1 $ 3.5
Distributions declared (23.0) (13.6) (45.4) (29.1)
Balance at end of period 32.9   32.9  
Redeemable Noncontrolling Interest        
Redeemable Noncontrolling Interest, Equity, Carrying Amount [Roll Forward]        
Balance at beginning of period     31.6 239.6
Net income attributable to noncontrolling interests     5.1 3.5
Distributions declared     (4.4) (4.2)
Contribution to joint venture     0.0 3.1
Purchase of redeemable noncontrolling interests     0.6 (162.3)
Exchange transaction     0.0 (46.3)
Balance at end of period $ 32.9 $ 33.4 $ 32.9 $ 33.4