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Reconciliation of Accrued Warranty Expense (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Product Liability Contingency [Line Items]
Balance at beginning of period	$ 38.0	$ 26.6	$ 22.4
Accruals for warranties issued during the period	34.5	29.2	26.5
Settlements of warranty claims	(21.0)	(17.8)	(22.3)
Balance at end of period	$ 51.5	$ 38.0	$ 26.6

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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