CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY AND NONCONTROLLING INTERESTS - USD ($) $ in Millions	Total	Common stock Common Class A	Common stock Common Class B	Common stock Class A exchangeable shares	Common stock Class B exchangeable shares	Paid-in capital	Retained earnings	Accumulated other comprehensive income (loss)	Common stock held in treasury	Noncontrolling interests
Beginning balance at Dec. 31, 2020	$ 12,621.3	$ 0.0	$ 2.1	$ 102.3	$ 417.8	$ 6,937.8	$ 6,544.2	$ (1,167.8)	$ (471.4)	$ 256.3	[1]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exchange of shares	0.0			(0.1)		0.1
Shares issued under equity compensation plan	0.6					0.6
Amortization of share-based compensation	32.1					32.1
Purchase of noncontrolling interest	(0.2)					0.3				(0.5)	[1]
Net income (loss) including noncontrolling interests	1,008.5						1,005.7			2.8	[1]
Other comprehensive income (loss), net of tax	161.3							161.8		(0.5)	[1]
Contributions from noncontrolling interests	3.2									3.2	[1]
Distributions and dividends to noncontrolling interests	(14.3)									(14.3)	[1]
Dividends declared	(148.4)						(148.4)
Ending balance at Dec. 31, 2021	13,664.1	0.0	2.1	102.2	417.8	6,970.9	7,401.5	(1,006.0)	(471.4)	247.0	[1]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exchange of shares	0.0				(4.5)	4.5
Shares issued under equity compensation plan	(2.9)					(2.9)
Amortization of share-based compensation	33.6					33.6
Purchase of noncontrolling interest	(1.4)					0.3				(1.7)	[1]
Net income (loss) including noncontrolling interests	(186.5)						(175.3)			(11.2)	[1]
Other comprehensive income (loss), net of tax	(201.9)							(199.5)		(2.4)	[1]
Share repurchase program	(51.5)								(51.5)
Contributions from noncontrolling interests	8.1									8.1	[1]
Distributions and dividends to noncontrolling interests	(14.3)									(14.3)	[1]
Dividends declared	(332.1)						(332.1)
Ending balance at Dec. 31, 2022	12,915.2	0.0	2.1	102.2	413.3	7,006.4	6,894.1	(1,205.5)	(522.9)	225.5	[1]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exchange of shares	0.0			(1.4)	(61.0)	62.4
Shares issued under equity compensation plan	0.2					0.2
Amortization of share-based compensation	44.9					44.9
Purchase of noncontrolling interest	(8.5)					(5.5)				(3.0)	[1]
Net income (loss) including noncontrolling interests	957.1						948.9			8.2	[1]
Deconsolidation of VIE	(8.8)									(8.8)
Other comprehensive income (loss), net of tax	90.1							89.2		0.9	[1]
Share repurchase program	(212.7)								(212.7)
Contributions from noncontrolling interests	2.4									2.4	[1]
Distributions and dividends to noncontrolling interests	(14.0)									(14.0)	[1]
Dividends declared	(358.7)						(358.7)
Ending balance at Dec. 31, 2023	$ 13,407.2	$ 0.0	$ 2.1	$ 100.8	$ 352.3	$ 7,108.4	$ 7,484.3	$ (1,116.3)	$ (735.6)	$ 211.2	[1]

[1] All activity included in the noncontrolling interests column of the consolidated statements of stockholders' equity and noncontrolling interests excludes activity from our redeemable noncontrolling interests.