STOCK-BASED COMPENSATION

3 Months Ended

Mar. 31, 2013

STOCK-BASED COMPENSATION

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
	March 31,
	2013		2012
Stock-based compensation cost	$	17.2	$	15.0
Tax benefit	$	6.2	$	5.4

During the first three months of 2013, the Company granted 0.5 million employee stock options, which had a weighted average grant date fair value of$17.58 per share based on the Black-Scholes option-pricing model. The Company also granted 1.3 million shares of restricted stock in the first three months of 2013, which had a weighted average grant date fair value of $46.48 per share and generally vest ratably over a four-year period. Additionally, the Company granted approximately 0.3 million shares of performance-basedawards 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 $44.07 per share.

       The following weighted average assumptions were used in determining the fair value for options granted in 2013:

Expected dividend yield	1.72%
Expected stock volatility	43%
Risk-free interest rate	1.53%
Expected holding period	7.2 years
Grant date fair value	$ 17.58

Unrecognized compensation expense at March 31, 2013 was $17.6million and $106.9 million for stock options and unvested restricted stock, respectively, which is expected to be recognized over a weighted average period of 1.5 years and 1.9 years, respectively. Additionally, there was $24.1million of unrecognized compensation expense relating to the aforementioned non-market based performance-based awards, which is expected to be recognized over a weighted average period of 1.1 years.

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

	Three Months Ended
	March 31,
Stock option exercises:	2013		2012
Proceeds from stock option exercises	$	31.4	$	39.8
Aggregate intrinsic value	$	21.8	$	23.6
Tax benefit realized upon exercise	$	7.7	$	9.0
	Three Months Ended
	March 31,
Restricted stock vesting:	2013		2012
Fair value of shares vested	$	53.8	$	36.1
Tax benefit realized upon vesting	$	19.1	$	12.8
	Three Months Ended
	March 31,
Performance-based awards	2013		2012
Fair value of shares vested	$	25.5	$	-
Tax benefit realized upon vesting	$	9.7	$	-