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Share-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Restricted Stock
Shares of restricted stock granted at Dec. 31:
(Shares in Thousands)
 
2019
 
2018
 
2017
Granted shares
 
13

 
18

 
15

Grant date fair value
 
$
53.46

 
$
44.68

 
$
42.00

Changes in nonvested restricted stock:
(Shares in Thousands)
 
Shares
 
Weighted Average
Grant Date Fair Value
Nonvested restricted stock at Jan. 1, 2019
 
36

 
$
44.29

Granted
 
13

 
53.46

Forfeited
 

 

Vested
 
(19
)
 
41.60

Dividend equivalents
 
1

 
57.09

Nonvested restricted stock at Dec. 31, 2019
 
31

 
50.15


Other Equity Awards
Equity award units granted to employees (excluding restricted stock):
(Units in Thousands)
 
2019
 
2018
 
2017
Granted units
 
483

 
500

 
503

Weighted average grant date fair value
 
$
49.67

 
$
47.60

 
$
41.02

Equity awards vested:
(Units in Thousands)
 
2019
 
2018
 
2017
Vested Units
 
464

 
475

 
467

Total Fair Value
 
$
29,432

 
$
23,393

 
$
22,459

Changes in the nonvested portion of equity award units:
(Units in Thousands)
 
Units
 
Weighted Average
Grant Date Fair Value
Nonvested Units at Jan. 1, 2019
 
939

 
$
44.30

Granted
 
483

 
49.67

Forfeited
 
(116
)
 
50.19

Vested
 
(464
)
 
41.09

Dividend equivalents
 
38

 
45.22

Nonvested Units at Dec. 31, 2019
 
880

 
48.20


Stock Equivalent Unit Plan
Stock equivalent units granted:
(Units in Thousands)
 
2019
 
2018
 
2017
Granted units
 
29

 
36

 
51

Weighted average grant date fair value
 
$
58.44

 
$
45.44

 
$
46.05

Changes in stock equivalent units:
(Units in Thousands)
 
Units
 
Weighted Average
Grant Date Fair Value
Stock equivalent units at Jan. 1, 2019
 
688

 
$
30.93

Granted
 
29

 
58.44

Units distributed
 
(11
)
 
32.56

Dividend equivalents
 
19

 
57.28

Stock equivalent units at Dec. 31, 2019
 
725

 
32.72


TSR Liability Awards
TSR liability awards granted:
(In Thousands)
 
2019
 
2018
 
2017
Awards granted
 
225

 
239

 
240

TSR liability awards settled:
(In Thousands)
 
2019
 
2018
 
2017
Awards settled
 
466

 
482

 
454

Settlement amount (cash, common stock and deferred amounts)
 
$
24,930

 
$
21,534

 
$
19,083


Compensation costs related to share-based awards
Compensation costs related to share-based awards:
(Millions of Dollars)
 
2019
 
2018
 
2017
Compensation cost for share-based awards (a)
 
$
58

 
$
45

 
$
57

Tax benefit recognized in income
 
15

 
12

 
22

(a) 
Compensation costs for share-based payment are included in O&M expense.