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Summary of Activities Related to Unrecognized Tax Benefits (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning Balance	$ 4.0	$ 4.3	$ 3.8
Increases related to current year tax	1.4	0.2	1.3
Increases from prior period positions	0.4	0.1	0
Decreases from settlements with tax authorities	0	0	(0.2)
Decreases from prior period positions	(0.2)	(0.2)	0
Decreases due to lapse of statute of limitations	(0.8)	(0.4)	(0.6)
Ending Balance	$ 4.8	$ 4.0	$ 4.3

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Unrecognized Tax Benefit

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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