Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended			6 Months Ended			36 Months Ended	6 Months Ended
	Jun. 30, 2012 Vendor LegalMatter	Dec. 31, 2011 LegalMatter	Dec. 31, 2010 LegalMatter	Jun. 30, 2012 Single Incident	Jun. 30, 2011 Single Incident	Dec. 31, 2011 Single Incident	Dec. 31, 2011 Cumulative Trauma	Jun. 30, 2012 Uninsured Cumulative Trauma	Jun. 30, 2011 Uninsured Cumulative Trauma	Jun. 30, 2012 Other Current Assets	Jun. 30, 2012 Other Non-Current Assets
Loss Contingencies [Line Items]
Reserves for product liability claims				$ 4.6		$ 4.7
Product liability expense				0.6	0.7		102.7	5.9	0
Number of lawsuits	2,567	2,321	1,900
Number of insurance carriers	20
Insurance receivables	$ 116.0	$ 112.1	$ 89.0							$ 2.0	$ 114.0