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Changes in Company's Warranty Liabilities (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Commitments Disclosure [Line Items]
Beginning Balance	$ 6.7	$ 5.5
Provisions to expense	5.8	9.7
Actual costs incurred	(5.7)	(8.5)
Ending Balance	$ 6.8	$ 6.7

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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