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Compensation Cost and Related Tax Benefits (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 3.5	$ 3.5	$ 9.8	$ 9.5
Tax benefit	(1.2)	(1.2)	(3.4)	(3.3)
Stock-based compensation expense, net of taxes	$ 2.3	$ 2.3	$ 6.4	$ 6.2

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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