Condensed Consolidated Statement of Changes in Stockholders' Equity (unaudited) - 6 months ended Jun. 30, 2018 - USD ($) $ in Millions	Total	Common stock	Additional paid-in capital	Retained earnings	Accumulated other comprehensive loss	Treasury stock
Balances at December 31, 2017 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]
Adoption of ASC 606	14.3			14.3
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)
Balances at March 31, 2018 at Jun. 30, 2018	$ 7,302.9	$ 1.1	$ 1,691.6	$ 5,833.4	$ (204.6)	$ (18.6)