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Employee Stock and Incentive Plans (Tables) | 12 Months Ended
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Dec. 31, 2014
Employee Stock and Incentive Plans [Abstract] |
Employee Stock Ownership Plan [Table Text Block] |
As of December 31 | 2014 |  | 2013 |  | 2012 |
Millions |  |  |
ESOP Shares |  |  |
Allocated | 1.9 |  | 2.0 |  | 2.2 |
Unallocated | 0.3 |  | 0.5 |  | 0.7 |
Total | 2.2 |  | 2.5 |  | 2.9 |
Fair Value of Unallocated Shares |  | $13.2 |  |  | $24.1 |  |  | $28.7 |
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 | 2014 |  | 2013 |  | 2012 |
Millions |  |  |
Performance Shares |  | $1.6 |  |  | $1.7 |  |  | $1.4 |
Restricted Stock Units | 0.7 |  | 0.7 |  | 0.7 |
Total Share-Based Compensation Expense |  | $2.3 |  |  | $2.4 |  |  | $2.1 |
Income Tax Benefit |  | $1.0 |  |  | $1.0 |  |  | $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, 2014, 2013 and 2012.
| 2014 | 2013 | 2012
| 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, | 108,299 |  |  | $44.10 |  | 395,678 |  |  | $42.28 |  | 460,234 |  |  | $41.68 |
Granted (a) | — |  | — |  | — |  | — |  | — |  | — |
Exercised | (42,020 | ) |  | $43.65 |  | (287,379 | ) |  | $41.60 |  | (49,075 | ) |  | $35.84 |
Forfeited | — |  | — |  | — |  | — |  | (15,481 | ) |  | $44.86 |
Outstanding as of December 31, | 66,279 |  |  | $44.39 |  | 108,299 |  |  | $44.10 |  | 395,678 |  |  | $42.28 |
Exercisable as of December 31, | 66,279 |  |  | $44.39 |  | 108,299 |  |  | $43.17 |  | 395,678 |  |  | $41.71 |
(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, 2014 | $39.10 to $41.35 | $44.15 to $48.65
Options Outstanding and Exercisable: |  |
Number Outstanding and Exercisable | 21,849 |  | 44,430 |
Weighted Average Remaining Contractual Life (Years) | 2.9 |  | 1.7 |
Weighted Average Exercise Price |  | $39.27 |  |  | $46.90 |
Aggregate Intrinsic Value (Millions) |  | $0.3 |  |  | $0.4 |
Performance Shares [Table Text Block] | Performance Shares. The following table presents information regarding our non-vested performance shares as of December 31, 2014, 2013 and 2012.
| 2014 | 2013 | 2012
| 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, | 114,765 |  |  | $47.02 |  | 107,899 |  |  | $40.73 |  | 128,333 |  |  | $36.54 |
Granted (a) | 47,992 |  |  | $46.47 |  | 45,830 |  |  | $52.15 |  | 38,764 |  |  | $44.70 |
Awarded | (36,515 | ) |  | $42.01 |  | (18,605 | ) |  | $35.10 |  | (41,009 | ) |  | $34.25 |
Unearned Grant Award | — |  | — |  | (18,606 | ) |  | $35.10 |  | (17,575 | ) |  | $34.25 |
Forfeited | (6,607 | ) |  | $48.29 |  | (1,753 | ) |  | $47.26 |  | (614 | ) |  | $34.49 |
Non-vested as of December 31, | 119,635 |  |  | $48.26 |  | 114,765 |  |  | $47.02 |  | 107,899 |  |  | $40.73 |
(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 as of December 31, 2014, 2013 and 2012.
| 2014 | 2013 | 2012
| 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, | 55,982 |  |  | $40.85 |  | 56,415 |  |  | $36.61 |  | 63,464 |  |  | $32.57 |
Granted (a) | 19,645 |  |  | $48.44 |  | 21,440 |  |  | $43.41 |  | 18,162 |  |  | $40.83 |
Awarded | (18,860 | ) |  | $37.64 |  | (20,939 | ) |  | $32.03 |  | (24,707 | ) |  | $29.43 |
Forfeited | (2,879 | ) |  | $45.92 |  | (934 | ) |  | $41.02 |  | (504 | ) |  | $31.80 |
Available as of December 31, | 53,888 |  |  | $44.47 |  | 55,982 |  |  | $40.85 |  | 56,415 |  |  | $36.61 |
(a) Shares granted include accrued dividends.

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