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Stock-Based Compensation Plans (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Stock-Based Compensation Plans
Stock-based compensation expense (in dollars)	$ 1.1	$ 4.5
Restricted stock units
Stock-Based Compensation Plans
Shares granted	1.5
Average grant date fair value (in dollars per share)	$ 0.69

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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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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