Condensed Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions		Common stock	Additional paid-in capital	Retained earnings	Accumulated other comprehensive income (loss)	Treasury Stock	Noncontrolling interest	Total
Balances at Dec. 31, 2022		$ 4.9	$ 10,740.4	$ 16,697.3	$ (6,879.0)	$ (10,586.9)	$ 41.1	$ 10,017.8
Increase (decrease) in stockholders' equity
Common stock issued			19.8					19.8
Stock-based compensation			31.4	(2.9)			0.1	28.6
Treasury stock acquired, common						(188.5)		(188.5)
Dividends to common stockholders				(155.5)				(155.5)
Distributions to noncontrolling interest							(2.1)	(2.1)
Contributions from noncontrolling interest							1.4	1.4
Purchase of subsidiary shares from noncontrolling interest	[1]		(1.2)					(1.2)
Adjustments to redemption amount of redeemable noncontrolling interest			0.5				0.1	0.6
Net income (loss)	[1]			(140.1)			1.1	(139.0)
Other comprehensive income (loss)	[1]				677.7		1.2	678.9
Balances at Mar. 31, 2023		4.9	10,790.9	16,398.8	(6,201.3)	(10,775.4)	42.9	10,260.8
Balances at Dec. 31, 2023		4.9	10,908.6	16,683.5	(5,345.3)	(11,335.7)	45.7	10,961.7
Increase (decrease) in stockholders' equity
Common stock issued			12.9					12.9
Stock-based compensation			34.3	(3.0)			0.1	31.4
Treasury stock acquired, common						(232.3)		(232.3)
Dividends to common stockholders				(162.4)				(162.4)
Distributions to noncontrolling interest							(2.5)	(2.5)
Contributions from noncontrolling interest							2.1	2.1
Adjustments to redemption amount of redeemable noncontrolling interest			(1.7)				(0.4)	(2.1)
Net income (loss)	[1]			532.5			1.5	534.0
Other comprehensive income (loss)	[1]				89.2		(1.6)	87.6
Balances at Mar. 31, 2024		$ 4.9	$ 10,954.1	$ 17,050.6	$ (5,256.1)	$ (11,568.0)	$ 44.9	$ 11,230.4

[1] Excludes amounts attributable to redeemable noncontrolling interest. See Note 14, Stockholders’ Equity, for further details.