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Employee Stock and Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2013
Employee Stock and Incentive Plans [Abstract]  
Employee Stock Ownership Plan [Table Text Block]
Year Ended December 31
2013

2012

2011

Millions
 
 
 
ESOP Shares
 
 
 
Allocated
2.0

2.2

2.2

Unallocated
0.5

0.7

1.0

Total
2.5

2.9

3.2

Fair Value of Unallocated Shares

$24.1


$28.7


$42.0
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
2013

2012

2011

Millions
 
 
 
Performance Shares

$1.7


$1.4


$1.1

Restricted Stock Units
0.7

0.7

0.5

Total Share-Based Compensation Expense

$2.4


$2.1


$1.6

Income Tax Benefit

$1.0


$0.9


$0.7
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, 2013.

 
2013
2012
2011
 
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,
395,678


$42.28

460,234


$41.68

560,887


$40.69

Granted (a)
—

—

—

—

—

—

Exercised
287,379


$41.60

49,075


$35.84

80,798


$34.25

Forfeited
—

—

15,481


$44.86

19,855


$43.96

Outstanding as of December 31,
108,299


$44.10

395,678


$42.28

460,234


$41.68

Exercisable as of December 31,
108,299


$43.17

395,678


$41.71

460,234


$41.59

(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, 2013
$37.76 to $41.35
$44.15 to $48.65
Options Outstanding and Exercisable:
 
 
Number Outstanding and Exercisable
44,263

64,036

Weighted Average Remaining Contractual Life (Years)
2.6

2.7

Weighted Average Exercise Price

$40.18


$46.81
Performance Shares [Table Text Block]
Performance Shares. The following table presents information regarding our non-vested performance shares as of December 31, 2013.

 
2013
2012
2011
 
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,
107,899


$40.73

128,333


$36.54

122,489


$38.15

Granted (a)
45,830


$52.15

38,764


$44.70

39,312


$41.00

Awarded
(18,605
)

$35.10

(41,009
)

$34.25

(32,368
)

$48.10

Unearned Grant Award
(18,606
)

$35.10

(17,575
)

$34.25

—

—

Forfeited
(1,753
)

$47.26

(614
)

$34.49

(1,100
)

$34.35

Non-vested as of December 31,
114,765


$47.02

107,899


$40.73

128,333


$36.54

(a)    Shares granted includes 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, 2013.

 
2013
2012
2011
 
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,
56,415


$36.61

63,464


$32.57

43,803


$30.61

Granted (a)
21,440


$43.41

18,162


$40.83

20,136


$36.74

Awarded
(20,939
)

$32.03

(24,707
)

$29.43

(215
)

$30.30

Forfeited
(934
)

$41.02

(504
)

$31.80

(260
)

$29.41

Available as of December 31,
55,982


$40.85

56,415


$36.61

63,464


$32.57

(a)    Shares granted includes accrued dividends.