Acquisitions (Pro Forma Adjustments Affecting Net Earnings) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Business Acquisition [Line Items]
Depreciation and amortization of purchased assets, pre-tax	$ (0.5)	$ (2.6)	$ (4.2)	$ (8.3)
Acquisition-related expenses, pre-tax	2.7	0.5	4.5	1.2
Restructuring and impairment charges, pre-tax	1.2	0.4	2.6	(2.2)
Inventory fair value adjustment, pre-tax			0.3
Other pro forma adjustments, pre-tax	(0.1)	(0.2)	3.9	(14.9)
Income taxes	$ (1.1)	$ 2.3	$ (1.9)	$ 12.5