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Changes in Company's Warranty Liabilities (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Commitments Disclosure [Line Items]
Balance at January 1	$ 6.8	$ 6.7
Provisions to expense	2.2	1.8
Payments	(1.8)	(1.6)
Balance at March 31	$ 7.2	$ 6.9

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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