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 beginning of period at Dec. 31, 2020	$ 10,479.8	$ 1.1	$ 2,097.5	$ 8,546.2	$ (147.0)	$ (18.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	289.0			289.0
Stock option exercises	19.2		19.2
Treasury stock sold	4.7		4.6			0.1
Currency translation adjustments	14.6				14.6
Stock-based compensation	32.4		32.4
Restricted stock activity	(14.8)		(14.8)
Dividends declared	(59.2)			(59.2)
Balance at end of period at Mar. 31, 2021	10,765.7	1.1	2,138.9	8,776.0	(132.4)	(17.9)
Balance at beginning of period at Dec. 31, 2021	11,563.8	1.1	2,307.8	9,455.6	(183.1)	(17.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	2,020.5			2,020.5
Stock option exercises	38.7		38.7
Cash settlement of share-based awards in connection with disposition of discontinued operations	(11.1)		(11.1)
Treasury stock sold	5.5		5.4			0.1
Currency translation adjustments	(22.9)				(22.9)
Stock-based compensation	40.8		40.8
Restricted stock activity	(17.7)		(17.7)
Dividends declared	(65.7)			(65.7)
Balance at end of period at Mar. 31, 2022	$ 13,551.9	$ 1.1	$ 2,363.9	$ 11,410.4	$ (206.0)	$ (17.5)