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Share-Based Compensation (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-Based Compensation (Details) [Abstract]
Share-based compensation expense	$ 45.4	$ 43.9	$ 41.1
Tax benefit	16.7	16.3	15.4
Share-based compensation expense, net of tax benefit	28.7	27.6	25.7
Cash received upon the exercise of stock options and from employee stock purchases	9.4	11.1	22.2
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation		(8.1)	(51.0)
Additional Paid-in Capital [Member]
Share-Based Compensation (Details) [Abstract]
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	$ (8.3)	$ (8.1)	$ (51.0)

Tax benefit associated with any equity-based compensation plan other than an employee stock ownership plan (ESOP). The tax benefit results from the deduction by the entity on its tax return for an award of stock that exceeds the cumulative compensation cost for common stock or preferred stock recognized for financial reporting. Includes any resulting tax benefit that exceeds the previously recognized deferred tax asset (excess tax benefits).

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