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LONG-TERM INCENTIVE EMPLOYEE COMPENSATION - Employee Compensation Costs (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-based compensation expense, equity-based awards	$ 3.2	$ 3.0	$ 6.2	$ 5.8
Share-based compensation expense, liability-based awards	0	(0.2)	0.9	0.4
Total share-based compensation expense in operating income (loss)	$ 3.2	$ 2.8	$ 7.1	$ 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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