Consolidated Statements of Total Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive (Loss) Earnings	Retained Earnings	Total Shareholders’ Equity	Noncontrolling Interests
Beginning Balance at Dec. 31, 2016	$ 4,142.6	$ 0.6	$ 3,334.5	$ (130.7)	$ 935.7	$ 4,140.1	$ 2.5
Beginning Balance (in shares) at Dec. 31, 2016		63,200,000
Consolidated net earnings	713.4				713.3	713.3	0.1
Other comprehensive (loss) earnings	1.6			1.6		1.6
Dividends declared	(108.9)				(108.9)	(108.9)
Issuances of common stock for stock award plans	14.9		14.9			14.9
Issuances of common stock for stock award plans (in shares)		200,000
Shares withheld for employees’ income tax obligations	(11.8)		(11.8)			(11.8)
Repurchases of common stock	$ (100.0)				(100.0)	(100.0)
Repurchases of common stock, Shares	(500,000)	(500,000)
Stock-based compensation expense	$ 30.5		30.5			30.5
Contribution from owners of noncontrolling interest	0.2						0.2
Ending Balance at Dec. 31, 2017	4,682.5	$ 0.6	3,368.1	(129.1)	1,440.1	4,679.7	2.8
Ending Balance (in shares) at Dec. 31, 2017		62,900,000
Consolidated net earnings	470.4				470.0	470.0	0.4
Other comprehensive (loss) earnings	(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)		100,000
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	(500,000)	(500,000)
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	62,500,000	62,500,000
Consolidated net earnings	$ 612.0				611.9	611.9	0.1
Other comprehensive (loss) earnings	(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
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	(400,000)
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	62,400,000	62,400,000