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Employee Stock and Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Employee Stock Ownership Plan [Table Text Block]
As of December 31
2015

2014

2013

Millions
 
 
 
ESOP Shares
 
 
 
Allocated
1.8

1.9

2.0

Unallocated
—

0.3

0.5

Total
1.8

2.2

2.5

Fair Value of Unallocated Shares
—


$13.2


$24.1
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
2015

2014

2013

Millions
 
 
 
Performance Shares

$1.8


$1.6


$1.7

Restricted Stock Units
0.8

0.7

0.7

Total Share-Based Compensation Expense

$2.6


$2.3


$2.4

Income Tax Benefit

$1.1


$1.0


$1.0
Non-Qualified Stock Options [Table Text Block]
Non-Qualified Stock Options. The following table presents information regarding our outstanding stock options.
 
2015
2014
2013
 
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
66,279


$44.39

108,299


$44.10

395,678


$42.28

Granted (a)
—

—

—

—

—

—

Exercised
(24,456
)

$44.52

(42,020
)

$43.65

(287,379
)

$41.60

Forfeited
(2,169
)
$42.93
—

—

—

—

Outstanding as of December 31
39,654


$44.39

66,279


$44.39

108,299


$44.10

Exercisable as of December 31
39,654


$44.39

66,279


$44.39

108,299


$43.17

(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, 2015
$39.10
$44.15
$48.65
Options Outstanding and Exercisable:
 
 
 
Number Outstanding and Exercisable
16,620

2,306

20,728

Weighted Average Remaining Contractual Life (Years)
2.1

0.1

1.1

Weighted Average Exercise Price

$39.10


$44.15


$48.65

Aggregate Intrinsic Value (Millions)

$0.2

—


$0.1
Performance Shares [Table Text Block]
Performance Shares. The following table presents information regarding our non-vested performance shares.
 
2015
2014
2013
 
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
119,635


$48.26

114,765


$47.02

107,899


$40.73

Granted (a)
43,583


$58.95

47,992


$46.47

45,830


$52.15

Awarded
—

—

(36,515
)

$42.01

(18,605
)

$35.10

Unearned Grant Award
(36,670
)

$45.41

—

—

(18,606
)

$35.10

Forfeited
(7,008
)

$53.49

(6,607
)

$48.29

(1,753
)

$47.26

Non-vested as of December 31
119,540


$52.72

119,635


$48.26

114,765


$47.02

(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.
 
2015
2014
2013
 
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
53,888


$44.47

55,982


$40.85

56,415


$36.61

Granted (a)
26,702


$54.81

19,645


$48.44

21,440


$43.41

Awarded
(19,464
)

$41.44

(18,860
)

$37.64

(20,939
)

$32.03

Forfeited
(3,432
)

$51.52

(2,879
)

$45.92

(934
)

$41.02

Available as of December 31
57,694


$49.86

53,888


$44.47

55,982


$40.85

(a)    Shares granted include accrued dividends.