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Employee Stock and Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2012
Employee Stock and Incentive Plans [Abstract]  
Employee Stock Ownership Plan [Table Text Block]
Year Ended December 31
2012
2011
2010
Millions
 
 
 
ESOP Shares
 
 
 
Allocated
2.2

2.2

2.2

Unallocated
0.7

1.0

1.3

Total
2.9

3.2

3.5

Fair Value of Unallocated Shares

$28.7


$42.0


$48.4
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
2012
2011
2010
Millions
 
 
 
Stock Options
—

—


$0.1

Performance Shares

$1.4


$1.1

1.5

Restricted Stock Units
0.7

0.5

0.6

Total Share-Based Compensation Expense

$2.1


$1.6


$2.2

Income Tax Benefit

$0.9


$0.7


$0.9
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, 2012.

 
2012
2011
2010
 
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,
460,234


$41.68

560,887


$40.69

646,235


$40.05

Granted (a)
—

—

—

—

—

—

Exercised
49,075


$35.84

80,798


$34.25

40,769


$27.76

Forfeited
15,481


$44.86

19,855


$43.96

44,579


$43.16

Outstanding as of December 31,
395,678


$42.28

460,234


$41.68

560,887


$40.69

Exercisable as of December 31,
395,678


$41.71

460,234


$41.59

523,491


$39.76

(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, 2012
$23.79 to $26.91
$37.76 to $41.35
$44.15 to $48.65
Options Outstanding and Exercisable:
 
 
 
Number Outstanding and Exercisable
1,340

236,052

158,286

Weighted Average Remaining Contractual Life (Years)
0.1

3.5

3.6

Weighted Average Exercise Price

$23.79


$39.64


$46.38
Performance Shares [Table Text Block]
Performance Shares. The following table presents information regarding our non-vested performance shares as of December 31, 2012.

 
2012
2011
2010
 
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,
128,333


$36.54

122,489


$38.15

121,825


$41.96

Granted (a)
38,764


$44.70

39,312


$41.00

49,302


$35.44

Awarded
(41,009
)

$34.25

(32,368
)

$48.10

—

—

Unearned Grant Award
(17,575
)

$34.25

—

—

(22,909
)

$54.50

Forfeited
(614
)

$34.49

(1,100
)

$34.35

(25,729
)

$36.45

Non-vested as of December 31,
107,899


$40.73

128,333


$36.54

122,489


$38.15

(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, 2012.

 
2012
2011
2010
 
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,
63,464


$32.57

43,803


$30.61

28,983


$29.41

Granted (a)
18,162


$40.83

20,136


$36.74

26,589


$31.83

Awarded
(24,707
)

$29.43

(215
)

$30.30

(3,091
)

$29.75

Forfeited
(504
)

$31.80

(260
)

$29.41

(8,678
)

$30.62

Available as of December 31,
56,415


$36.61

63,464


$32.57

43,803


$30.61

(a)    Shares granted includes accrued dividends.