Redeemable Noncontrolling Interests - Redeemable Noncontrolling Interests Activity (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Redeemable Noncontrolling Interest, Equity, Carrying Amount Roll Forward [Abstract] [Abstract]
Balance at beginning of period	$ 31.6
Net income attributable to noncontrolling interests	9.0	$ 7.4	$ 12.6
Distributions declared	(87.8)	(72.1)	(70.2)
Change in fair value		1.4	(147.6)
Balance at end of period	42.2	31.6
Redeemable Noncontrolling Interest
Redeemable Noncontrolling Interest, Equity, Carrying Amount Roll Forward [Abstract] [Abstract]
Balance at beginning of period	31.6	239.6	261.7
Net income attributable to noncontrolling interests	9.0	7.4	12.6
Distributions declared	(8.0)	(8.5)	(9.2)
Contribution to joint ventures	0.0	3.1	1.0
Reclassification to noncontrolling interests	0.0	0.0	(11.2)
Purchase of redeemable noncontrolling interests	0.0	(162.3)	(162.9)
Exchange transaction	0.0	(46.3)	0.0
Change in fair value	4.5	(1.4)	147.6
Other	5.1	0.0	0.0
Balance at end of period	$ 42.2	$ 31.6	$ 239.6