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Employee Stock and Incentive Plans (Tables) | 12 Months Ended
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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.

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