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Share-Based Compensation Share-Based Compensation And Benefit Plans (Employee Share Purchase Plan Activity) (Details) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended	12 Months Ended
	Jan. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation [Abstract]
Stock Issued During Period, Shares, Employee Stock Purchase Plans	4,985	20,137	19,914	29,100
Weighted Average Fair Value Of Shares Purchased Under Employee Share Purchase Plan		$ 67.80	$ 63.29	$ 50.70
Allocated Share-based Compensation Expense		$ 0.3	$ 0.3	$ 0.5

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

Number of shares issued during the period as a result of an employee stock purchase plan.

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