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Long-Term Incentive Employee Compensation (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Long-Term Incentive Employee Compensation Costs
Share-based compensation expense, equity-based awards	$ 3.0	$ 3.6	$ 5.8	$ 7.1
Share-based compensation expense, liability-based awards	(0.2)	1.0	0.4	2.3
Total share-based compensation expense in operating income (loss)	2.8	4.6	6.2	9.4
Less: tax benefit	1.1	1.6	2.2	3.3
Share-based compensation expense, net of tax	$ 1.7	$ 3.0	$ 4.0	$ 6.1

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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