Consolidated Statements of Total Equity - 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, 2017	$ 4,682.5	$ 0.6	$ 3,368.1	$ (129.1)	$ 1,440.1	$ 4,679.7	$ 2.8
Beginning Balance (in shares) at Dec. 31, 2017		62.9
Consolidated net earnings	470.4				470.0	470.0	0.4
Other comprehensive loss	(14.5)			(14.5)		(14.5)
Dividends declared	(116.4)				(116.4)	(116.4)
Issuances of common stock for stock award plans	14.2		14.2			14.2
Issuances of common stock for stock award plans (in shares)		0.1
Shares withheld for employees’ income tax obligations	(11.9)		(11.9)			(11.9)
Repurchases of common stock	$ (100.4)				(100.4)	(100.4)
Repurchases of common stock, Shares	(0.5)	(0.5)
Stock-based compensation expense	$ 29.3		29.3			29.3
Noncontrolling interest acquired in business combination	9.0						9.0
Purchase of the noncontrolling interest in the existing joint venture	(12.8)		(3.6)			(3.6)	(9.2)
Ending Balance at Dec. 31, 2018	4,949.4	$ 0.6	3,396.1	(143.6)	1,693.3	4,946.4	3.0
Ending Balance (in shares) at Dec. 31, 2018		62.5
Consolidated net earnings	612.0				611.9	611.9	0.1
Other comprehensive loss	(2.2)			(2.2)		(2.2)
Dividends declared	(129.8)				(129.8)	(129.8)
Issuances of common stock for stock award plans	16.7		16.7			16.7
Issuances of common stock for stock award plans (in shares)		0.3
Shares withheld for employees’ income tax obligations	(28.1)		(28.1)			(28.1)
Repurchases of common stock	$ (98.2)				(98.2)	(98.2)
Repurchases of common stock, Shares	(0.4)	(0.4)
Stock-based compensation expense	$ 34.1		34.1			34.1
Distribution to owners of noncontrolling interest	(0.6)						(0.6)
Ending Balance at Dec. 31, 2019	$ 5,353.3	$ 0.6	3,418.8	(145.8)	2,077.2	5,350.8	2.5
Ending Balance (in shares) at Dec. 31, 2019	62.4	62.4
Consolidated net earnings	$ 721.1				721.0	721.0	0.1
Other comprehensive loss	(12.6)			(12.6)		(12.6)
Dividends declared	(140.5)				(140.5)	(140.5)
Issuances of common stock for stock award plans	6.8		6.8			6.8
Issuances of common stock for stock award plans (in shares)		0.1
Shares withheld for employees’ income tax obligations	(14.8)		(14.8)			(14.8)
Repurchases of common stock	$ (50.0)				(50.0)	(50.0)
Repurchases of common stock, Shares	(0.2)	(0.2)
Stock-based compensation expense	$ 30.0		30.0			30.0
Ending Balance at Dec. 31, 2020	$ 5,893.3	$ 0.6	$ 3,440.8	$ (158.4)	$ 2,607.7	$ 5,890.7	$ 2.6
Ending Balance (in shares) at Dec. 31, 2020	62.3	62.3