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Employee Stock and Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
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
2018

2017

2016

Millions
 
 
 
Performance Shares

$2.3


$2.1


$1.8

Restricted Stock Units
0.9

1.0

0.8

Total Share-Based Compensation Expense

$3.2


$3.1


$2.6

Income Tax Benefit

$0.9


$0.9


$1.1
Performance Shares [Table Text Block]
Performance Shares. The following table presents information regarding our non-vested performance shares.
 
2018
2017
2016
 
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
127,898


$58.23

127,580


$52.56

119,540


$52.72

Granted (a)
66,557


$76.42

50,729


$62.90

57,189


$52.43

Awarded
(58,293
)
$59.82
—

—

—

—

Unearned Grant Award
—

—

(40,801
)

$46.27

(42,126
)

$52.70

Forfeited
(6,469
)

$72.99

(9,610
)

$58.29

(7,023
)

$53.45

Non-vested as of December 31
129,693


$66.12

127,898


$58.23

127,580


$52.56

(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.
 
2018
2017
2016
 
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
55,248


$56.18

54,728


$51.79

57,694


$49.86

Granted (a)
16,573


$71.11

21,241


$62.20

20,351


$50.25

Awarded
(18,881
)

$55.78

(17,281
)

$49.72

(19,661
)

$44.33

Forfeited
(3,169
)

$64.92

(3,440
)

$56.00

(3,656
)

$52.87

Available as of December 31
49,771


$60.74

55,248


$56.18

54,728


$51.79

(a)    Shares granted include accrued dividends.