Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2011

Stock-Based Compensation

Stock-Based Compensation Cost and Associated Tax Benefit

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2011		2010		2011		2010
Stock compensation cost	$	14.3	$	12.9	$	30.3		$	27.7
Tax benefit	$	5.6	$	4.7	$	11.2		$	10.6

Weighted Average Assumptions Used in Determining the Fair Value for Options Granted

Expected dividend yield		1.53	%
Expected stock volatility		41	%
Risk-free interest rate		3.34	%
Expected holding period		7.6 yrs
Grant date fair value	$	12.45

Stock Option Exercises and Restricted Stock Vesting

	Six Months Ended
	June 30,
	2011		2010
Stock option exercises:
Proceeds from stock option exercises	$	39.6	$	17.5
Aggregate intrinsic value	$	19.3	$	9.1
Tax benefit realized upon exercise	$	7.7	$	3.7
	Six Months Ended
	June 30,
	2011		2010
Restricted stock vesting:
Fair value of shares vested	$	18.8	$	12.4
Tax benefit realized upon vesting	$	7.0	$	4.6