Condensed Consolidated Statements of Stockholders’ Equity (Unaudited) - USD ($) shares in Millions, $ in Millions		Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Retained Earnings	Treasury Stock
Balance at beginning (in shares) at Dec. 31, 2023			47.7
Balance at the beginning of the period at Dec. 31, 2023		$ 2,829.0	$ 78.7	$ 553.8	$ (111.1)	$ 5,634.0	$ (3,326.4)
Balance at beginning (in shares) at Dec. 31, 2023							30.9
Increase (Decrease) in Shareholders' Equity
Net income		1,149.0				1,149.0
Other comprehensive income (loss)		8.8			8.8
Dividends		(127.7)				(127.7)
Repurchases of common stock (in shares)	[1]		(2.9)				2.9
Repurchases of common stock	[1]	(1,176.0)					$ (1,176.0)
Stock-based compensation (in shares)	[2]		0.6				(0.6)
Stock-based compensation	[2]	79.8		26.9			$ 52.9
Balance at ending (in shares) at Sep. 30, 2024			45.4
Balance at the end of the period at Sep. 30, 2024		2,762.9	$ 78.7	580.7	(102.3)	6,655.3	$ (4,449.5)
Balance at ending (in shares) at Sep. 30, 2024							33.2
Balance at beginning (in shares) at Jun. 30, 2024			46.4
Balance at the beginning of the period at Jun. 30, 2024		3,004.3	$ 78.7	570.3	(113.0)	6,456.9	$ (3,988.6)
Balance at beginning (in shares) at Jun. 30, 2024							32.2
Increase (Decrease) in Shareholders' Equity
Net income		244.3				244.3
Other comprehensive income (loss)		10.7			10.7
Dividends		(45.9)				(45.9)
Repurchases of common stock (in shares)	[3]		(1.1)				1.1
Repurchases of common stock	[3]	(470.5)					$ (470.5)
Stock-based compensation (in shares)	[4]		0.1				(0.1)
Stock-based compensation	[4]	20.0		10.4			$ 9.6
Balance at ending (in shares) at Sep. 30, 2024			45.4
Balance at the end of the period at Sep. 30, 2024		$ 2,762.9	$ 78.7	580.7	(102.3)	6,655.3	$ (4,449.5)
Balance at ending (in shares) at Sep. 30, 2024							33.2
Balance at beginning (in shares) at Dec. 31, 2024		44.4	44.4
Balance at the beginning of the period at Dec. 31, 2024		$ 2,463.3	$ 78.7	589.0	(110.1)	6,773.1	$ (4,867.4)
Balance at beginning (in shares) at Dec. 31, 2024		34.2					34.2
Increase (Decrease) in Shareholders' Equity
Net income		$ 613.3				613.3
Other comprehensive income (loss)		31.2			31.2
Dividends		(135.5)				(135.5)
Repurchases of common stock (in shares)	[1]		(2.8)				2.8
Repurchases of common stock	[1]	(1,009.2)					$ (1,009.2)
Stock-based compensation (in shares)	[2]		0.3				(0.3)
Stock-based compensation	[2]	$ 28.7		3.9			$ 24.8
Balance at ending (in shares) at Sep. 30, 2025		41.9	41.9
Balance at the end of the period at Sep. 30, 2025		$ 1,991.8	$ 78.7	592.9	(78.9)	7,250.9	$ (5,851.8)
Balance at ending (in shares) at Sep. 30, 2025		36.7					36.7
Balance at beginning (in shares) at Jun. 30, 2025			42.6
Balance at the beginning of the period at Jun. 30, 2025		$ 2,120.6	$ 78.7	585.6	(72.2)	7,083.8	$ (5,555.3)
Balance at beginning (in shares) at Jun. 30, 2025							36.0
Increase (Decrease) in Shareholders' Equity
Net income		214.2				214.2
Other comprehensive income (loss)		(6.7)			(6.7)
Dividends		(47.1)				(47.1)
Repurchases of common stock (in shares)	[3]		(0.8)				0.8
Repurchases of common stock	[3]	(302.9)					$ (302.9)
Stock-based compensation (in shares)	[4]		0.1				(0.1)
Stock-based compensation	[4]	$ 13.7		7.3			$ 6.4
Balance at ending (in shares) at Sep. 30, 2025		41.9	41.9
Balance at the end of the period at Sep. 30, 2025		$ 1,991.8	$ 78.7	$ 592.9	$ (78.9)	$ 7,250.9	$ (5,851.8)
Balance at ending (in shares) at Sep. 30, 2025		36.7					36.7

[1] Repurchases of common stock include excise taxes on share repurchases.

[2] (2)Stock-based compensation includes stock options exercised net of tax, restricted and performance shares vested, and shares issued and deferred associated with deferred compensation.

[3] Repurchases of common stock include excise taxes on share repurchases.

[4] Stock-based compensation includes stock options exercised net of tax, restricted and performance shares vested, and shares issued and deferred associated with deferred compensation.