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Stock-Based Compensation (Fair Value of the Option Using Black-Scholes Option Pricing Model, Weighted Average Assumptions) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Stock Option Plans [Member]
Average risk free interest rate	1.95%	2.33%	2.30%	2.33%
Average expected term (years)	4.6	4.6	4.8	4.8
Average expected volatility	35.00%	37.00%	35.00%	35.00%
Weighted average fair value at grant date	$ 113.55	$ 115.53	$ 114.67	$ 111.69
Total stock-based compensation expense	$ 32.8	$ 28.3	$ 62.8	$ 53.2
Employee Stock Purchase Plan [Member]
Average risk free interest rate			0.37%	0.49%
Average expected term (years)			1.3	1.3
Average expected volatility			35.00%	35.00%
Weighted average fair value at grant date			$ 97.07	$ 99.34
Total stock-based compensation expense	$ 2.0	$ 2.0	$ 4.1	$ 3.9

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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