Consolidated Statements of Total Equity (Unaudited) - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Retained Earnings	Total Shareholders' Equity	Noncontrolling Interests
Beginning Balance at Dec. 31, 2018	$ 4,949.4	$ 0.6	$ 3,396.1	$ (143.6)	$ 1,693.3	$ 4,946.4	$ 3.0
Beginning Balance (in shares) at Dec. 31, 2018		62.5
Consolidated net earnings	480.9				480.9	480.9
Other comprehensive earnings, net of tax	8.8			8.8		8.8
Dividends declared	(95.2)				(95.2)	(95.2)
Issuances of common stock for stock award plans	15.4		15.4			15.4
Issuances of common stock for stock award plans (in shares)		0.2
Shares withheld for employees' income tax obligations	(25.4)		(25.4)			(25.4)
Repurchases of common stock	(57.3)				(57.3)	(57.3)
Repurchases of common stock, Shares		(0.2)
Stock-based compensation expense	28.4		28.4			28.4
Distributions to owners of noncontrolling interest	(0.6)						(0.6)
Ending Balance at Sep. 30, 2019	5,304.4	$ 0.6	3,414.5	(134.8)	2,021.7	5,302.0	2.4
Ending Balance (in shares) at Sep. 30, 2019		62.5
Beginning Balance at Jun. 30, 2019	5,097.3	$ 0.6	3,416.6	(137.3)	1,815.0	5,094.9	2.4
Beginning Balance (in shares) at Jun. 30, 2019		62.4
Consolidated net earnings	248.6				248.6	248.6
Other comprehensive earnings, net of tax	2.5			2.5		2.5
Dividends declared	(34.6)				(34.6)	(34.6)
Issuances of common stock for stock award plans	4.9		4.9			4.9
Issuances of common stock for stock award plans (in shares)		0.1
Shares withheld for employees' income tax obligations	(13.2)		(13.2)			(13.2)
Repurchases of common stock	(7.3)				(7.3)	(7.3)
Stock-based compensation expense	6.2		6.2			6.2
Ending Balance at Sep. 30, 2019	5,304.4	$ 0.6	3,414.5	(134.8)	2,021.7	5,302.0	2.4
Ending Balance (in shares) at Sep. 30, 2019		62.5
Beginning Balance at Dec. 31, 2019	5,353.3	$ 0.6	3,418.8	(145.8)	2,077.2	5,350.8	2.5
Beginning Balance (in shares) at Dec. 31, 2019		62.4
Consolidated net earnings	538.0				538.0	538.0
Other comprehensive earnings, net of tax	7.2			7.2		7.2
Dividends declared	(104.7)				(104.7)	(104.7)
Issuances of common stock for stock award plans	5.7		5.7			5.7
Issuances of common stock for stock award plans (in shares)		0.1
Shares withheld for employees' income tax obligations	(13.0)		(13.0)			(13.0)
Repurchases of common stock	(50.0)				(50.0)	(50.0)
Repurchases of common stock, Shares		(0.2)
Stock-based compensation expense	22.4		22.4			22.4
Ending Balance at Sep. 30, 2020	5,758.9	$ 0.6	3,433.9	(138.6)	2,460.5	5,756.4	2.5
Ending Balance (in shares) at Sep. 30, 2020		62.3
Beginning Balance at Jun. 30, 2020	5,493.6	$ 0.6	3,431.0	(142.2)	2,201.7	5,491.1	2.5
Beginning Balance (in shares) at Jun. 30, 2020		62.3
Consolidated net earnings	294.4				294.4	294.4
Other comprehensive earnings, net of tax	3.6			3.6		3.6
Dividends declared	(35.6)				(35.6)	(35.6)
Issuances of common stock for stock award plans	0.2		0.2			0.2
Stock-based compensation expense	2.7		2.7			2.7
Ending Balance at Sep. 30, 2020	$ 5,758.9	$ 0.6	$ 3,433.9	$ (138.6)	$ 2,460.5	$ 5,756.4	$ 2.5
Ending Balance (in shares) at Sep. 30, 2020		62.3