Consolidated Statements of Total Equity (Unaudited) - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Retained Earnings	Total Shareholders' Equity	Noncontrolling Interests
Beginning Balance, Total Equity at Dec. 31, 2021	$ 6,537.6	$ 0.6	$ 3,470.4	$ (97.6)	$ 3,161.9	$ 6,535.3	$ 2.3
Beginning Balance (in shares) at Dec. 31, 2021		62,393,990
Consolidated net earnings (loss)	683.0				683.2	683.2	(0.2)
Other comprehensive earnings / loss, net of tax	(27.5)			(27.5)		(27.5)
Dividends declared	(118.1)				(118.1)	(118.1)
Issuances of common stock for stock award plans	4.7		4.7			4.7
Issuances of common stock for stock award plans (in shares)		115,040
Shares withheld for employees' income tax obligations	(26.2)		(26.2)			(26.2)
Repurchases of common stock, Shares		(418,336)
Repurchases of common stock	(150.0)				(150.0)	(150.0)
Stock-based compensation expense	34.3		34.3			34.3
Ending Balance, Total Equity at Sep. 30, 2022	6,937.8	$ 0.6	3,483.2	(125.1)	3,577.0	6,935.7	2.1
Ending Balance (in shares) at Sep. 30, 2022		62,090,694
Beginning Balance, Total Equity at Jun. 30, 2022	6,772.1	$ 0.6	3,474.4	(128.1)	3,423.1	6,770.0	2.1
Beginning Balance (in shares) at Jun. 30, 2022		62,374,140
Consolidated net earnings (loss)	295.3				295.3	295.3
Other comprehensive earnings / loss, net of tax	3.0			3.0		3.0
Dividends declared	(41.4)				(41.4)	(41.4)
Issuances of common stock for stock award plans (in shares)		4,339
Shares withheld for employees' income tax obligations	(1.1)		(1.1)			(1.1)
Repurchases of common stock, Shares		287,785
Repurchases of common stock	(100.0)				(100.0)	(100.0)
Stock-based compensation expense	9.9		9.9			9.9
Ending Balance, Total Equity at Sep. 30, 2022	6,937.8	$ 0.6	3,483.2	(125.1)	3,577.0	6,935.7	2.1
Ending Balance (in shares) at Sep. 30, 2022		62,090,694
Beginning Balance, Total Equity at Dec. 31, 2022	$ 7,172.8	$ 0.6	3,489.0	(38.5)	3,719.4	7,170.5	2.3
Beginning Balance (in shares) at Dec. 31, 2022	62,102,353	62,102,353
Consolidated net earnings (loss)	$ 886.8				886.4	886.4	0.4
Other comprehensive earnings / loss, net of tax	3.2			3.2		3.2
Dividends declared	(128.6)				(128.6)	(128.6)
Issuances of common stock for stock award plans	2.0		2.0			2.0
Issuances of common stock for stock award plans (in shares)		86,328
Shares withheld for employees' income tax obligations	(18.8)		(18.8)			(18.8)
Repurchases of common stock, Shares		(381,520)
Repurchases of common stock	(151.2)				(151.2)	(151.2)
Stock-based compensation expense	39.0		39.0			39.0
Contribution from owners of minority interest	0.1						0.1
Distributions to owners of noncontrolling interest	(0.5)						(0.5)
Ending Balance, Total Equity at Sep. 30, 2023	$ 7,804.8	$ 0.6	3,511.2	(35.3)	4,326.0	7,802.5	2.3
Ending Balance (in shares) at Sep. 30, 2023	61,807,161	61,807,161
Beginning Balance, Total Equity at Jun. 30, 2023	$ 7,423.4	$ 0.6	3,500.8	(35.7)	3,955.4	7,421.1	2.3
Beginning Balance (in shares) at Jun. 30, 2023		61,803,396
Consolidated net earnings (loss)	416.6				416.7	416.7	(0.1)
Other comprehensive earnings / loss, net of tax	0.4			0.4		0.4
Dividends declared	(46.1)				(46.1)	(46.1)
Issuances of common stock for stock award plans (in shares)		3,765
Shares withheld for employees' income tax obligations	(1.0)		(1.0)			(1.0)
Stock-based compensation expense	11.4		11.4			11.4
Contribution from owners of minority interest	0.1						0.1
Ending Balance, Total Equity at Sep. 30, 2023	$ 7,804.8	$ 0.6	$ 3,511.2	$ (35.3)	$ 4,326.0	$ 7,802.5	$ 2.3
Ending Balance (in shares) at Sep. 30, 2023	61,807,161	61,807,161