CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Millions	Total	Common Stock	Treasury Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning Balance at Dec. 31, 2021	$ 3,233.2	$ 292.8	$ (2,667.7)	$ 310.3	$ 5,366.0	$ (68.2)
Beginning Balance (in shares) at Dec. 31, 2021		292,800,000	(50,300,000)
Net income	204.4	$ 0.0	$ 0.0	0.0	204.4	0.0
Other comprehensive income (loss)	15.0	0.0	0.0	0.0	0.0	15.0
Cash dividends	(63.7)	0.0	0.0	0.0	(63.7)	0.0
Stock purchases	0.0	$ 0.0	$ (20.0)	20.0	0.0	0.0
Stock purchases (in shares)		(0.0)	(200,000)
Stock based compensation expense and stock option plan transactions	14.0	$ 0.0	$ 10.1	3.9	0.0	0.0
Stock based compensation expense and stock option plan transactions (in shares)		0.0	300,000
Ending Balance at Mar. 31, 2022	3,402.9	$ 292.8	$ (2,677.6)	334.2	5,506.7	(53.2)
Ending Balance (in shares) at Mar. 31, 2022		292,800,000	(50,200,000)
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		293,700,000	(49,800,000)
Net income	203.2	$ 0.0	$ 0.0	0.0	203.2	0.0
Other comprehensive income (loss)	3.1	0.0	0.0	0.0	0.0	3.1
Cash dividends	(66.3)	0.0	0.0	0.0	(66.3)	0.0
Stock based compensation expense and stock option plan transactions	37.8	0.0	$ 10.3	27.8	(0.3)	0.0
Stock based compensation expense and stock option plan transactions (in shares)			300,000
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		293,700,000	(49,500,000)