CONSOLIDATED STATEMENTS OF CHANGES IN OWNERS' EQUITY AND SERIES A PREFERRED STOCK - USD ($) $ in Millions	Total	Cumulative Effect, Period of Adoption, Adjustment [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Retained Earnings (Accumulated Deficit) [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Noncontrolling Interests [Member]	Series A Preferred Stock	Series A Preferred Stock Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance at Dec. 31, 2020	$ 5,903.2	$ (448.3)	$ 0.2	$ 4,839.9	$ (448.3)	$ (1,893.5)	$ (141.8)	$ (150.9)	$ 3,249.3
Balance (in shares) at Dec. 31, 2020			228,062,000					6,731,000
Series A Preferred Stock at Dec. 31, 2020										$ 301.4	$ 448.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Compensation on equity grants	59.2			59.2
Dividend equivalent rights	(3.1)			(3.1)
Shares issued under compensation program (in shares)			1,312,000
Shares tendered for tax withholding obligations	(13.2)							$ (13.2)
Shares tendered for tax withholding obligations (in shares)			(397,000)					397,000
Repurchases of common stock	$ (40.0)							$ (40.0)
Repurchases of common stock (in shares)	(756,478)		(756,000)					756,000
Series A Preferred Stock dividends
Preferred stock dividends	$ (87.3)					(87.3)
Dividends in excess of retained earnings				(87.3)		87.3
Common stock dividends
Common stock dividends	(91.5)					(91.5)
Dividends in excess of retained earnings				(91.5)		91.5
Distributions to noncontrolling interests	(449.1)								(449.1)
Contributions from noncontrolling interests	15.8								15.8
Other comprehensive income (loss)	(89.1)						(89.1)
Net income (loss)	422.1					71.2			350.9
Balance at Dec. 31, 2021	5,178.7		$ 0.2	4,268.9		(1,822.3)	(230.9)	$ (204.1)	3,166.9
Balance (in shares) at Dec. 31, 2021			228,221,000					7,884,000
Series A Preferred Stock at Dec. 31, 2021										749.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Compensation on equity grants	57.5			57.5
Dividend equivalent rights	(7.1)			(7.1)
Shares issued under compensation program (in shares)			1,834,000
Shares tendered for tax withholding obligations	(35.8)							$ (35.8)
Shares tendered for tax withholding obligations (in shares)			(601,000)					601,000
Repurchases of common stock	$ (224.8)							$ (224.8)
Repurchases of common stock (in shares)	(3,412,354)		(3,412,000)					3,412,000
Series A Preferred Stock dividends
Preferred stock dividends	$ (30.0)					(30.0)
Dividends in excess of retained earnings				(30.0)		30.0
Deemed dividends - redemption of Series A Preferred Stock	(215.5)			(215.5)
Common stock dividends
Common stock dividends	(318.3)					(318.3)
Dividends in excess of retained earnings				(318.3)		318.3
Redemption of Series A preferred Stock										(749.7)
Distributions to noncontrolling interests	(354.5)								(354.5)
Contributions from noncontrolling interests	26.1								26.1
Repurchase of noncontrolling interests, net of tax	(911.1)			(53.2)					(857.9)
Other comprehensive income (loss)	285.6						285.6
Net income (loss)	1,531.4					1,195.5			335.9
Balance at Dec. 31, 2022	4,982.2		$ 0.2	3,702.3		(626.8)	54.7	$ (464.7)	2,316.5
Balance (in shares) at Dec. 31, 2022			226,042,000					11,897,000
Series A Preferred Stock at Dec. 31, 2022										0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Compensation on equity grants	62.4			62.4
Dividend equivalent rights	(3.9)			(2.3)		(1.6)
Shares issued under compensation program (in shares)			2,156,000
Shares tendered for tax withholding obligations	(55.8)							$ (55.8)
Shares tendered for tax withholding obligations (in shares)			(716,000)					716,000
Repurchases of common stock	$ (373.7)							$ (373.7)
Repurchases of common stock (in shares)	(4,870,559)		(4,871,000)					4,871,000
Excise tax on repurchases of common stock	$ (2.7)							$ (2.7)
Common stock dividends
Common stock dividends	(419.0)					(419.0)
Dividends in excess of retained earnings				193.5		(193.5)
Distributions to noncontrolling interests	(230.0)								(230.0)
Contributions from noncontrolling interests	9.7								9.7
Repurchase of noncontrolling interests, net of tax	(969.4)			(510.1)					(459.3)
Other comprehensive income (loss)	30.9						30.9
Net income (loss)	1,579.3					1,345.9			233.4
Balance at Dec. 31, 2023	$ 4,610.0		$ 0.2	$ 3,058.8		$ 492.0	$ 85.6	$ (896.9)	$ 1,870.3
Balance (in shares) at Dec. 31, 2023			222,611,000					17,484,000
Series A Preferred Stock at Dec. 31, 2023										$ 0.0