Acquisitions and Dispositions - Pro Forma Adjustments Affecting Net Earnings (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Business Combinations [Abstract]
Depreciation and amortization of purchased assets, pre-tax	$ 3.9	$ 1.4
Acquisition-related expenses, pre-tax	18.9	16.0
Restructuring, impairment and other charges, pre-tax	29.4	8.1
Inventory fair value adjustments, pre-tax	10.8	3.5
Other pro forma adjustments, pre-tax	1.2	(3.2)
Income taxes	$ (16.6)	$ (1.9)