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Stock-Based Compensation Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Stock-Based Compensation Plans
Stock-based compensation expense	$ 0	$ 4.1	$ 4.5	$ 13.4
Reduction in stock based compensation expense due to forfeitures	1.2		4.1
Reversal of accrued severance expense	$ 1.0

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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