Stock-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2012

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Total compensation expense for all stock-based compensation plans

Stock-based compensation expense recognized was as follows:

	Year Ended December 31,
(dollars in millions)	2012		2011		2010
Outstanding restricted and deferred stock units and awards	$	32.6	$	25.6	$	26.0
Unvested outstanding stock options		12.1		11.1		8.5
Total stock-based compensation expense	$	44.7	$	36.7	$	34.5

Summary of activity in all stock based compensation plans

A summary of option activity under the Company's stock compensation plans as of and for the year ended December 31, 2012 is presented below:

Options	Shares			Weighted- Average Exercise Price	Weighted- Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value (dollars in millions)
Outstanding at January 1, 2012	5,757,456		$	38.36	4.55	$	63.8
Granted	668,361			56.04
Exercised	(1,439,428	)		31.47
Forfeited	(216,746	)		37.85
Expired	–			–
Outstanding at December 31, 2012	4,769,643		$	42.94	5.02	$	64.5
Vested at December 31, 2012 or expected to vest in the future	4,754,339		$	42.91	5.01	$	64.4
Exercisable at December 31, 2012	3,175,276		$	38.98	3.61	$	55.5

Share-based payment award, stock options, valuation assumptions

The fair values per share of option grants for the years ended December 31, 2012, 2011 and 2010 were estimated using the Black-Scholes-Merton option pricing formula with the following weighted-average assumptions:

	Year Ended December 31,
	2012			2011			2010
Expected life (in years)		3.2			2.8			2.5
Risk-free interest rate		0.37	%		0.38	%		0.46	%
Volatility		39.4	%		42.6	%		43.8	%
Expected dividend yield		0.0	%		0.0	%		0.0	%

Share-based payment award, options, grants in period, grant date intrinsic value

The above assumptions and market prices of the Company's common stock at the date of option exercises resulted in the following values:

	Year Ended December 31,
	2012		2011		2010
Grant-date fair value per option	$	15.68	$	14.47	$	11.78
Intrinsic value of options exercised (dollars in millions)	$	33.7	$	31.5	$	63.4
Average intrinsic value per share of options exercised	$	23.39	$	26.79	$	22.46

Restricted and deferred stock units granted and vesting

Information on restricted and deferred stock units granted and vesting during the three years ended December 31, 2012 follows:

	Year Ended December 31,
	2012		2011		2010
Number of units granted with performance conditions		211,244		139,191		211,804
Intrinsic value of units vesting (dollars in millions)	$	38.2	$	36.9	$	29.2
Total number of units granted		674,578		682,246		806,041
Weighted average grant date fair value per unit	$	50.44	$	50.67	$	41.81

Stock Options [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of activity in all stock based compensation plans

A summary of restricted and deferred stock unit award activity under the Company's stock compensation plans as of and for the year ended December 31, 2012 is presented below:

Restricted and Deferred Stock Units	Number			Weighted-Average Grant Date Fair Value
Nonvested at January 1, 2012		1,909,355		$	30.25
Granted		674,578			50.44
Vested		(808,342	)		49.60
Forfeited		(62,084	)		47.47
Nonvested at December 31, 2012		1,713,507		$	28.11

Total unrecognized compensation expense for all stock-based compensation plans

	At
	December 31, 2012
Stock-based compensation cost not yet recognized under the straight-line method (dollars in millions)	$	15.9
Weighted-average remaining expense recognition period (in years)		1.49

Restricted and Deferred Stock Units [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Total unrecognized compensation expense for all stock-based compensation plans

	At December 31, 2012
Stock-based compensation cost not yet recognized under the straight-line method (dollars in millions)	$	31.8
Weighted-average remaining expense recognition period (in years)		1.53