NOTE 2. STOCK-BASED COMPENSATION

Presented below is a summary of the stock-based compensation cost and associated tax benefit included in the accompanying consolidated statements of operations:


	Three Months Ended September 30,				Nine Months Ended September 30,
	2011		2010		2011		2010
Stock compensation cost	$	12.9	$	13.6	$	43.2	$	41.3
Tax benefit	$	5.0	$	5.0	$	16.2	$	15.6

During the first nine months of 2011, the Company granted 0.6 million employee stock options, which had a weighted average grant date fair value of $12.49 per share based on the Black-Scholes option-pricing model. The Company also granted 1.5 million shares of restricted stock in the first nine months of 2011, which had a weighted average grant date fair value of $30.05 per share and generally vest ratably over a four-year period. Additionally, the Company granted approximately 0.4 million shares of restricted stock that contain a condition whereby the number of shares that ultimately vest are based on the achievement of certain non-market based performance metrics of the Company over a three-year period. The weighted average grant date fair value of these awards was $28.76 per share.

The following weighted average assumptions were used in determining the fair value for options granted in 2011:


Expected dividend yield		1.53	%
Expected stock volatility		41	%
Risk-free interest rate		3.33	%
Expected holding period		7.6 yrs
Grant date fair value	$	12.49

Unrecognized compensation expense at September 30, 2011 was $24.1 million and $50.6 million for stock options and nonvested restricted stock, respectively, which is expected to be recognized over a weighted average period of 1.4 years and 1.7 years, respectively. Additionally, there was $14.1 million of unrecognized compensation expense relating to the aforementioned non-market based performance awards which is expected to be recognized over a weighted average period of 1.0 years.

The following tables summarize information relating to stock option exercises and restricted stock vesting:


	Nine Months Ended September 30,
	2011		2010
Stock option exercises:
Proceeds from stock option exercises	$	41.5	$	28.5
Aggregate intrinsic value	$	20.4	$	16.3
Tax benefit realized upon exercise	$	8.0	$	6.6


	Nine Months Ended September 30,
	2011		2010
Restricted stock vesting:
Fair value of shares vested	$	18.8	$	12.4
Tax benefit realized upon vesting	$	7.0	$	4.6