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Compensation Cost and Related Tax Benefits (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
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 2.2	$ 2.6	$ 6.3	$ 6.0
Tax benefit	(0.8)	(0.9)	(2.2)	(2.1)
Stock-based compensation expense, net of taxes	$ 1.4	$ 1.7	$ 4.1	$ 3.9

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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