Income Taxes - Deferred Taxes in Consolidated Balance Sheets (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Schedule Of Deferred Tax Assets And Liabilities [Line Items]
Current assets	$ 19.9	$ 23.9
Non-current assets	21.4	45.4
Current liabilities	(3.5)	(2.2)
Other non-current liabilities	(26.2)	(13.6)
Net deferred taxes	$ 11.6	$ 53.5

Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed within one year or operating cycle, if longer.

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Amount after allocation of valuation allowances of noncurrent deferred tax asset attributable to deductible temporary differences and carryforwards. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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Amount of deferred tax liability attributable to taxable temporary differences, net of deferred tax asset attributable to deductible temporary differences and carryforwards net of valuation allowances expected to be realized or consumed within one year or operating cycle, if longer.

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- Definition

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