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Employee Stock and Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2014
Employee Stock and Incentive Plans [Abstract]  
Employee Stock Ownership Plan [Table Text Block]
As of December 31
2014

2013

2012

Millions
 
 
 
ESOP Shares
 
 
 
Allocated
1.9

2.0

2.2

Unallocated
0.3

0.5

0.7

Total
2.2

2.5

2.9

Fair Value of Unallocated Shares

$13.2


$24.1


$28.7
Share-Based Compensation Expense [Table Text Block]
The following share-based compensation expense amounts were recognized in our Consolidated Statement of Income for the periods presented.

Share-Based Compensation Expense
Year Ended December 31
2014

2013

2012

Millions
 
 
 
Performance Shares

$1.6


$1.7


$1.4

Restricted Stock Units
0.7

0.7

0.7

Total Share-Based Compensation Expense

$2.3


$2.4


$2.1

Income Tax Benefit

$1.0


$1.0


$0.9
Non-Qualified Stock Options [Table Text Block]
Non-Qualified Stock Options. The following table presents information regarding our outstanding stock options as of December 31, 2014, 2013 and 2012.

 
2014
2013
2012
 
Number of
Options
Weighted-Average
Exercise
Price
Number of
Options
Weighted-Average
Exercise
Price
Number of
Options
Weighted-Average
Exercise
Price
Outstanding as of January 1,
108,299


$44.10

395,678


$42.28

460,234


$41.68

Granted (a)
—

—

—

—

—

—

Exercised
(42,020
)

$43.65

(287,379
)

$41.60

(49,075
)

$35.84

Forfeited
—

—

—

—

(15,481
)

$44.86

Outstanding as of December 31,
66,279


$44.39

108,299


$44.10

395,678


$42.28

Exercisable as of December 31,
66,279


$44.39

108,299


$43.17

395,678


$41.71

(a)
Stock options have not been granted since 2008. The weighted-average grant-date intrinsic value of options granted in 2008 was $6.18.
Stock Options by Exercise Price Range [Table Text Block]
 
Range of Exercise Price
As of December 31, 2014
$39.10 to $41.35
$44.15 to $48.65
Options Outstanding and Exercisable:
 
 
Number Outstanding and Exercisable
21,849

44,430

Weighted Average Remaining Contractual Life (Years)
2.9

1.7

Weighted Average Exercise Price

$39.27


$46.90

Aggregate Intrinsic Value (Millions)

$0.3


$0.4
Performance Shares [Table Text Block]
Performance Shares. The following table presents information regarding our non-vested performance shares as of December 31, 2014, 2013 and 2012.

 
2014
2013
2012
 
Number of
Shares
Weighted-
Average
Grant Date
Fair Value
Number of
Shares
Weighted-
Average
Grant Date
Fair Value
Number of
Shares
Weighted-
Average
Grant Date
Fair Value
Non-vested as of January 1,
114,765


$47.02

107,899


$40.73

128,333


$36.54

Granted (a)
47,992


$46.47

45,830


$52.15

38,764


$44.70

Awarded
(36,515
)

$42.01

(18,605
)

$35.10

(41,009
)

$34.25

Unearned Grant Award
—

—

(18,606
)

$35.10

(17,575
)

$34.25

Forfeited
(6,607
)

$48.29

(1,753
)

$47.26

(614
)

$34.49

Non-vested as of December 31,
119,635


$48.26

114,765


$47.02

107,899


$40.73

(a)    Shares granted include accrued dividends.
Restricted Stock Units [Table Text Block]
Restricted Stock Units. The following table presents information regarding our available restricted stock units as of December 31, 2014, 2013 and 2012.

 
2014
2013
2012
 
Number of
Shares
Weighted- Average
Grant Date
Fair Value
Number of
Shares
Weighted- Average
Grant Date
Fair Value
Number of
Shares
Weighted- Average
Grant Date
Fair Value
Available as of January 1,
55,982


$40.85

56,415


$36.61

63,464


$32.57

Granted (a)
19,645


$48.44

21,440


$43.41

18,162


$40.83

Awarded
(18,860
)

$37.64

(20,939
)

$32.03

(24,707
)

$29.43

Forfeited
(2,879
)

$45.92

(934
)

$41.02

(504
)

$31.80

Available as of December 31,
53,888


$44.47

55,982


$40.85

56,415


$36.61

(a)    Shares granted include accrued dividends.