Common Equity (Tables)

12 Months Ended

Dec. 31, 2012

Common Equity (Tables) [Abstract]

Recorded pre-tax share-based compensation expense and related tax benefit for share-based awards made to employees and directors

The following table summarizes recorded pre-tax share-based compensation expense and the related tax benefit for share-based awards made to our employees and directors as of December 31:

	2012		2011		2010
	(Millions of Dollars)
Performance units	$	16.3	$	24.1	$	26.0
Stock options	2.7		2.6		7.6
Restricted stock	3.0		1.8		1.5
Share-based compensation expense	$	22.0	$	28.5	$	35.1
Related Tax Benefit	$	8.8	$	11.4	$	14.1

Stock option activity

The following is a summary of our stock option activity during 2012:

Stock Options	Number of Options		Weighted-Average Exercise Price		Weighted-Average Remaining Contractual Life (Years)	Aggregate Intrinsic Value (Millions)
Outstanding as of January 1, 2012	10,638,750		$	21.65
Granted	938,770		$	34.88
Exercised	(2,643,931	)	$	18.84
Forfeited	(13,920	)	$	28.88
Outstanding as of December 31, 2012	8,919,669		$	23.86	5.3	$	115.8
Exercisable as of December 31, 2012	7,217,394		$	22.19	4.6	$	105.8

Stock options outstanding

The following table summarizes information about stock options outstanding as of December 31, 2012:

	Options Outstanding				Options Exercisable
		Weighted-Average				Weighted-Average
Range of Exercise Prices	Number of Options	Exercise Price		Remaining Contractual Life (Years)	Number of Options	Exercise Price		Remaining Contractual Life (Years)
$12.71  to  $19.74	1,661,507	$	18.74	2.5	1,661,507	$	18.74	2.5
$21.11  to  $24.92	5,877,372	$	23.14	5.2	5,429,372	$	22.99	5.1
$29.35  to  $34.88	1,380,790	$	33.09	8.7	126,515	$	32.69	8.6
	8,919,669	$	23.86	5.3	7,217,394	$	22.19	4.6

Non-vested options

The following table summarizes information about our non-vested options during 2012:

Non-Vested Stock Options	Number of Options		Weighted- Average Fair Value
Non-Vested as of January 1, 2012	3,103,770		$	3.78
Granted	938,770		$	3.34
Vested	(2,326,345	)	$	3.96
Forfeited	(13,920	)	$	3.29
Non-Vested as of December 31, 2012	1,702,275		$	3.31

Restricted stock activity

Restricted Shares:   The Compensation Committee has also approved restricted stock grants to certain key employees and directors. The following restricted stock activity occurred during 2012:

Restricted Shares	Number of Shares		Weighted-Average Market Price
Outstanding as of January 1, 2012	192,558
Granted	94,959		$	34.46
Released	(93,250	)	$	29.87
Forfeited	(6,045	)	$	31.00
Outstanding as of December 31, 2012	188,222