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Summary of Restructuring Charges (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 0.4	$ (0.2)	$ 2.7	$ 1.9
Workforce Restructurings
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0.4	(0.6)	2.7	(0.1)
Lease/Contract Terminations
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 0.4		$ 2.0

Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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