Summary of Insurance Receivable Balances and Activity Related to Cumulative Trauma Product Liability Losses (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Movement in Loss Contingency Receivable, Increase (Decrease) [Roll Forward]
Balance January 1	$ 130.0	$ 112.1	$ 89.0
Additions	34.0	29.7	35.6
Collections and settlements	(39.2)	(11.8)	(12.5)
Balance December 31	$ 124.8	$ 130.0	$ 112.1