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Employee Stock and Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Employee Stock Ownership Plan [Table Text Block]
As of December 31
2017

2016

2015

Millions
 
 
 
ESOP Shares
 
 
 
Allocated
1.4

1.6

1.8

Unallocated
—

—

—

Total
1.4

1.6

1.8

Fair Value of Unallocated Shares
—

—

—
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
2017

2016

2015

Millions
 
 
 
Performance Shares

$2.1


$1.8


$1.8

Restricted Stock Units
1.0

0.8

0.8

Total Share-Based Compensation Expense

$3.1


$2.6


$2.6

Income Tax Benefit

$0.9


$1.1


$1.1
Non-Qualified Stock Options [Table Text Block]
Non-Qualified Stock Options. The following table presents information regarding our outstanding stock options.
 
2017
2016
2015
 
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
4,357


$40.29

39,654


$44.39

66,279


$44.39

Exercised
(4,357
)

$40.29

(35,297
)

$44.89

(24,456
)

$44.52

Forfeited
—

—

—

—

(2,169
)

$42.93

Outstanding as of December 31
—

—

4,357


$40.29

39,654


$44.39

Exercisable as of December 31
—

—

4,357


$40.29

39,654


$44.39
Performance Shares [Table Text Block]
Performance Shares. The following table presents information regarding our non-vested performance shares.
 
2017
2016
2015
 
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
127,580


$52.56

119,540


$52.72

119,635


$48.26

Granted (a)
50,729


$62.90

57,189


$52.43

43,583


$58.95

Unearned Grant Award
(40,801
)

$46.27

(42,126
)

$52.70

(36,670
)

$45.41

Forfeited
(9,610
)

$58.29

(7,023
)

$53.45

(7,008
)

$53.49

Non-vested as of December 31
127,898


$58.23

127,580


$52.56

119,540


$52.72

(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.
 
2017
2016
2015
 
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
54,728


$51.79

57,694


$49.86

53,888


$44.47

Granted (a)
21,241


$62.20

20,351


$50.25

26,702


$54.81

Awarded
(17,281
)

$49.72

(19,661
)

$44.33

(19,464
)

$41.44

Forfeited
(3,440
)

$56.00

(3,656
)

$52.87

(3,432
)

$51.52

Available as of December 31
55,248


$56.18

54,728


$51.79

57,694


$49.86

(a)    Shares granted include accrued dividends.