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Stock-Based Compensation Plans (Details 5) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Schedule of information on restricted stock units
Compensation expense	$ 13.7	$ 15.4	$ 12.8
Weighted-average grant date fair value	$ 31.78
Restricted Stock Units [Member]
Schedule of information on restricted stock units
Compensation expense	$ 6.6	$ 6.6	$ 6.6
Weighted-average grant date fair value	$ 32.34	$ 44.80	$ 35.09

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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