Acquisitions and Dispositions - Pro Forma Adjustments Affecting Net Earnings (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Business Combinations [Abstract]
Depreciation and amortization of purchased assets, pre-tax	$ 2.0	$ (2.5)	$ 2.4	$ 0.2
Acquisition-related expenses, pre-tax	0.2	(0.1)	18.8	14.8
Restructuring, impairment and other charges, pre-tax	4.5	3.0	28.6	5.6
Inventory fair value adjustment, pre-tax	6.7	(0.1)	9.9	3.5
Other pro forma adjustments, pre-tax		1.7	1.2	(2.8)
Income taxes	$ (4.8)	$ (1.2)	$ (15.0)	$ (1.1)