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Common Equity (Tables)
 12 Months Ended
Dec. 31, 2013
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:

 
2013
 
2012
 
2011
 
(Millions of Dollars)
 
 
 
 
 
 
Performance units
$
12.7

 
$
16.3

 
$
24.1

Stock options
3.9

 
2.7

 
2.6

Restricted stock
2.4

 
3.0

 
1.8

Share-based compensation expense
$
19.0

 
$
22.0

 
$
28.5

Related Tax Benefit
$
7.6

 
$
8.8

 
$
11.4
Stock option activity
The following is a summary of our stock option activity during 2013:

Stock Options
 
Number of Options
 
Weighted-Average Exercise Price
 
Weighted-Average Remaining Contractual Life (Years)
 
Aggregate Intrinsic Value (Millions)
Outstanding as of January 1, 2013
 
8,919,669

 
$
23.86

 
 
 
 
Granted
 
1,418,560

 
$
37.46

 
 
 
 
Exercised
 
(2,238,489
)
 
$
21.67

 
 
 
 
Forfeited
 
(10,030
)
 
$
35.37

 
 
 
 
Outstanding as of December 31, 2013
 
8,089,710

 
$
26.84

 
5.4
 
$
117.3

Exercisable as of December 31, 2013
 
5,708,920

 
$
23.16

 
4.1
 
$
103.8
Stock options outstanding
The following table summarizes information about stock options outstanding as of December 31, 2013:

 
 
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)
$16.72  to  $21.11
 
2,128,370

 
$
20.34

 
3.9
 
2,128,370

 
$
20.34

 
3.9
$23.88  to  $29.35
 
3,689,900

 
$
24.65

 
4.2
 
3,382,630

 
$
24.23

 
4.0
$34.88  to  $37.46
 
2,271,440

 
$
36.48

 
8.6
 
197,920

 
$
35.19

 
8.1
 
 
8,089,710

 
$
26.84

 
5.4
 
5,708,920

 
$
23.16

 
4.1
Non-vested options
The following table summarizes information about our non-vested options during 2013:

Non-Vested Stock Options
 
Number of Options 
 
Weighted- Average Fair Value
Non-Vested as of January 1, 2013
 
1,702,275

 
$
3.31

Granted
 
1,418,560

 
$
3.45

Vested
 
(730,015
)
 
$
3.34

Forfeited
 
(10,030
)
 
$
3.37

Non-Vested as of December 31, 2013
 
2,380,790

 
$
3.38
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 2013:

Restricted Shares
 
Number of Shares
 
Weighted-Average Market Price
Outstanding as of January 1, 2013
 
188,222

 
 
Granted
 
74,290

 
$
37.65

Released
 
(97,973
)
 
$
26.65

Forfeited
 
(13,841
)
 
$
33.35

Outstanding as of December 31, 2013
 
150,698