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Employee Stock and Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Employee Stock Ownership Plan [Table Text Block]
As of December 31
2016

2015

2014

Millions
 
 
 
ESOP Shares
 
 
 
Allocated
1.6

1.8

1.9

Unallocated
—

—

0.3

Total
1.6

1.8

2.2

Fair Value of Unallocated Shares
—

—


$13.2
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
2016

2015

2014

Millions
 
 
 
Performance Shares

$1.8


$1.8


$1.6

Restricted Stock Units
0.8

0.8

0.7

Total Share-Based Compensation Expense

$2.6


$2.6


$2.3

Income Tax Benefit

$1.1


$1.1


$1.0
Non-Qualified Stock Options [Table Text Block]
Non-Qualified Stock Options. The following table presents information regarding our outstanding stock options.
 
2016
2015
2014
 
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
39,654


$44.39

66,279


$44.39

108,299


$44.10

Granted (a)
—

—

—

—

—

—

Exercised
(35,297
)

$44.89

(24,456
)

$44.52

(42,020
)

$43.65

Forfeited
—

—

(2,169
)
$42.93
—

—

Outstanding as of December 31
4,357


$40.29

39,654


$44.39

66,279


$44.39

Exercisable as of December 31
4,357


$40.29

39,654


$44.39

66,279


$44.39

(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]
 
Exercise Price
As of December 31, 2016
$39.10
$48.65
Options Outstanding and Exercisable:
 
 
Number Outstanding and Exercisable
3,816

541

Weighted Average Remaining Contractual Life (Years)
1.1

0.1

Weighted Average Exercise Price

$39.10


$48.65

Aggregate Intrinsic Value (Millions)

$0.1

—
Performance Shares [Table Text Block]
Performance Shares. The following table presents information regarding our non-vested performance shares.
 
2016
2015
2014
 
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
119,540


$52.72

119,635


$48.26

114,765


$47.02

Granted (a)
57,189


$52.43

43,583


$58.95

47,992


$46.47

Awarded
—

—

—

—

(36,515
)

$42.01

Unearned Grant Award
(42,126
)

$52.70

(36,670
)

$45.41

—

—

Forfeited
(7,023
)

$53.45

(7,008
)

$53.49

(6,607
)

$48.29

Non-vested as of December 31
127,580


$52.56

119,540


$52.72

119,635


$48.26

(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.
 
2016
2015
2014
 
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
57,694


$49.86

53,888


$44.47

55,982


$40.85

Granted (a)
20,351


$50.25

26,702


$54.81

19,645


$48.44

Awarded
(19,661
)

$44.33

(19,464
)

$41.44

(18,860
)

$37.64

Forfeited
(3,656
)

$52.87

(3,432
)

$51.52

(2,879
)

$45.92

Available as of December 31
54,728


$51.79

57,694


$49.86

53,888


$44.47

(a)    Shares granted include accrued dividends.