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	232.3				232.3	232.3
Other comprehensive earnings, net of tax	6.3			6.3		6.3
Dividends declared	(60.6)				(60.6)	(60.6)
Issuances of common stock for stock award plans	10.5		10.5			10.5
Issuances of common stock for stock award plans (in shares)		0.1
Shares withheld for employees' income tax obligations	(12.3)		(12.3)			(12.3)
Repurchases of common stock	(50.0)				(50.0)	(50.0)
Repurchases of common stock, Shares		(0.2)
Stock-based compensation expense	22.3		22.3			22.3
Distributions to owners of noncontrolling interest	(0.6)						(0.6)
Ending Balance at Jun. 30, 2019	5,097.3	$ 0.6	3,416.6	(137.3)	1,815.0	5,094.9	2.4
Ending Balance (in shares) at Jun. 30, 2019		62.4
Beginning Balance at Mar. 31, 2019	4,975.5	$ 0.6	3,406.5	(140.3)	1,705.7	4,972.5	3.0
Beginning Balance (in shares) at Mar. 31, 2019		62.6
Consolidated net earnings	189.5				189.5	189.5
Other comprehensive earnings, net of tax	3.0			3.0		3.0
Dividends declared	(30.2)				(30.2)	(30.2)
Issuances of common stock for stock award plans	6.5		6.5			6.5
Shares withheld for employees' income tax obligations	(5.1)		(5.1)			(5.1)
Repurchases of common stock	(50.0)				(50.0)	(50.0)
Repurchases of common stock, Shares		(0.2)
Stock-based compensation expense	8.7		8.7			8.7
Distributions to owners of noncontrolling interest	(0.6)						(0.6)
Ending Balance at Jun. 30, 2019	5,097.3	$ 0.6	3,416.6	(137.3)	1,815.0	5,094.9	2.4
Ending Balance (in shares) at Jun. 30, 2019		62.4
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	243.5				243.5	243.5
Other comprehensive earnings, net of tax	3.6			3.6		3.6
Dividends declared	(69.0)				(69.0)	(69.0)
Issuances of common stock for stock award plans	5.6		5.6			5.6
Issuances of common stock for stock award plans (in shares)		0.1
Shares withheld for employees' income tax obligations	(13.1)		(13.1)			(13.1)
Repurchases of common stock	(50.0)				(50.0)	(50.0)
Repurchases of common stock, Shares		(0.2)
Stock-based compensation expense	19.7		19.7			19.7
Ending Balance at Jun. 30, 2020	5,493.6	$ 0.6	3,431.0	(142.2)	2,201.7	5,491.1	2.5
Ending Balance (in shares) at Jun. 30, 2020		62.3
Beginning Balance at Mar. 31, 2020	5,299.4	$ 0.6	3,423.1	(145.4)	2,018.6	5,296.9	2.5
Beginning Balance (in shares) at Mar. 31, 2020		62.2
Consolidated net earnings	217.6				217.6	217.6
Other comprehensive earnings, net of tax	3.2			3.2		3.2
Dividends declared	(34.5)				(34.5)	(34.5)
Issuances of common stock for stock award plans	1.1		1.1			1.1
Issuances of common stock for stock award plans (in shares)		0.1
Shares withheld for employees' income tax obligations	(0.4)		(0.4)			(0.4)
Stock-based compensation expense	7.2		7.2			7.2
Ending Balance at Jun. 30, 2020	$ 5,493.6	$ 0.6	$ 3,431.0	$ (142.2)	$ 2,201.7	$ 5,491.1	$ 2.5
Ending Balance (in shares) at Jun. 30, 2020		62.3