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Stock-Based Compensation Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Stock-Based Comp Plans
Stock-Based Compensation Plans - Disclosures
Compensation cost	$ 15.2	$ 11.8
Related income tax benefit	4.6	4.0
Capitalized as part of an asset	$ 0.7	$ 0.6
Amended and Restated 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)	8.3

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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