Consolidated Statement Of Stockholders' Equity (USD $) In Millions, unless otherwise specified	Total	Common Stock [Member]	Capital In Excess Of Par Value [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]
Balance at Dec. 31, 2011	$ 1,243.6	$ 114.7	$ 693.2	$ 482.9	$ (47.2)
Balance, shares at Dec. 31, 2011		114.7
Net earnings	161.5			161.5
Change in pension liability,net of taxes of $1.3 million	2.0				2.0
Foreign currency translation	17.4				17.4
Change in fair value of derivative instruments, net of taxes of $1.3 million	2.0				2.0
Compensation expense related to stock option plan grants	5.2		5.2
Tax impact from issuance of common stock	3.7		3.7
Common stock issued in:
Thirty-three acquisition transactions	259.5	7.3	252.2
Thirty-three purchase transactions (in shares)		7.3
Stock option plans	54.3	2.1	52.2
Stock option plans (in shares)	2.1	2.1
Employee stock purchase plan	6.6	0.2	6.4
Employee stock purchase plan (in shares)		0.2
Deferred compensation and restricted stock	4.8	0.1	4.7
Deferred compensation and restricted stock (in shares)		0.1
Other compensation expense	0.3		0.3
Common stock repurchases
Cash dividends declared on common stock	(124.7)			(124.7)
Balance at Sep. 30, 2012	$ 1,636.2	$ 124.4	$ 1,017.9	$ 519.7	$ (25.8)
Balance, shares at Sep. 30, 2012		124.4