Condensed Consolidated Statements of Changes in Stockholders' Equity (unaudited) - USD ($) $ in Millions	Total	Common stock	Additional paid-in capital	Retained earnings	Accumulated other comprehensive loss	Treasury stock
Balance at Dec. 31, 2017	$ 6,863.6	$ 1.0	$ 1,602.9	$ 5,464.6	$ (186.2)	$ (18.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	439.7			439.7
Stock option exercises	39.3	0.1	39.2
Treasury stock sold	2.8		2.7			0.1
Currency translation adjustments	(18.4)				(18.4)
Stock-based compensation	53.4		53.4
Restricted stock activity	(6.6)		(6.6)
Dividends declared	(85.2)			(85.2)
Balance at Jun. 30, 2018	7,302.9	1.1	1,691.6	5,833.4	(204.6)	(18.6)
Balance at Mar. 31, 2018	7,155.5	1.0	1,653.9	5,647.6	(128.4)	(18.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	228.4			228.4
Stock option exercises	10.2	0.1	10.1
Treasury stock sold	1.2		1.2			0.0
Currency translation adjustments	(76.2)				(76.2)
Stock-based compensation	27.7		27.7
Restricted stock activity	(1.3)		(1.3)
Dividends declared	(42.6)			(42.6)
Balance at Jun. 30, 2018	7,302.9	1.1	1,691.6	5,833.4	(204.6)	(18.6)
Balance at Dec. 31, 2018	7,738.5	1.1	1,751.5	6,247.7	(243.3)	(18.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	619.3			619.3
Stock option exercises	49.1		49.1
Treasury stock sold	3.6		3.5			0.1
Currency translation adjustments	0.1				0.1
Stock-based compensation	52.5		52.5
Restricted stock activity	(16.1)		(16.1)
Dividends declared	(96.0)			(96.0)
Balance at Jun. 30, 2019	8,351.0	1.1	1,840.5	6,771.0	(243.2)	(18.4)
Balance at Mar. 31, 2019	8,137.4	1.1	1,799.9	6,569.4	(214.6)	(18.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	249.7			249.7
Stock option exercises	12.3		12.3
Treasury stock sold	1.4		1.4			0.0
Currency translation adjustments	(28.6)				(28.6)
Stock-based compensation	28.2		28.2
Restricted stock activity	(1.3)		(1.3)
Dividends declared	(48.1)			(48.1)
Balance at Jun. 30, 2019	$ 8,351.0	$ 1.1	$ 1,840.5	$ 6,771.0	$ (243.2)	$ (18.4)

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