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Stock-Based Compensation Plans (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Stock-Based Comp Plans
Stock-Based Compensation Plans - Disclosures
Compensation cost	$ 46.3	$ 50.8	$ 48.8
Related income tax benefit	15.8	16.1	15.5
Capitalized as part of an asset	$ 2.6	$ 2.8	$ 3.7
2010 Stock Incentive Plan and 2005 Directors Stock Plan
Stock-Based Compensation Plans - Disclosures
Maximum number of new shares of common stock available for grant (in shares)	10.6

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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