CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Treasury Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning Balance at Dec. 31, 2022	$ 3,489.9	$ 293.7	$ (2,665.3)	$ 366.2	$ 5,524.6	$ (29.3)
Beginning Balance (in shares) at Dec. 31, 2022		293.7	(49.8)
Net income	203.2				203.2
Other comprehensive income (loss)	3.1					3.1
Cash dividends	(66.3)				(66.3)
Stock based compensation expense and stock option plan transactions	37.8			27.8	(0.3)	10.3
Stock based compensation expense and stock option plan transactions (in shares)			0.3
Ending Balance at Mar. 31, 2023	3,667.7	$ 293.7	$ (2,655.0)	394.0	5,661.2	(26.2)
Ending Balance (in shares) at Mar. 31, 2023		293.7	(49.5)
Beginning Balance at Dec. 31, 2023	3,855.4	$ 293.7	$ (2,878.2)	454.8	6,012.3	(27.2)
Beginning Balance (in shares) at Dec. 31, 2023		293.7	(50.6)
Net income	227.7				227.7
Other comprehensive income (loss)	(2.1)					(2.1)
Cash dividends	(69.0)				(69.0)
Stock based compensation expense and stock option plan transactions	88.7		$ 45.4	43.5	(0.2)
Stock based compensation expense and stock option plan transactions (in shares)			1.4
Ending Balance at Mar. 31, 2024	$ 4,100.7	$ 293.7	$ (2,832.8)	$ 498.3	$ 6,170.8	$ (29.3)
Ending Balance (in shares) at Mar. 31, 2024		293.7	(49.2)