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

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the description of the plan, the basis for determining contributions, including the employee groups covered, and the nature and effect of significant matters affecting comparability of information for all periods presented. For leveraged ESOPs and pension reversion ESOPs, the disclosure may include the basis for releasing shares and how dividends on allocated and unallocated shares are used. Disclosure may also include a description of the accounting policies followed for ESOP transactions, including the method of measuring compensation, the classification of dividends on ESOP shares, and the treatment of ESOP shares for EPS computations. If the employer has both old ESOP shares for which it does not adopt the latest guidance and new ESOP shares for which the new guidance is required, the accounting policies for both blocks of shares may be described. Disclosure may also include he amount of compensation cost recognized during the period, the number of allocated shares, committed-to-be-released shares, and suspense shares held by the ESOP at the balance-sheet date, the fair value of unearned ESOP shares at the balance-sheet date for shares accounted for under the latest guidance, the existence and nature of any repurchase obligation, including disclosure of the fair value of the shares allocated as of the balance sheet date, which are subject to a repurchase obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 93-6 -Paragraph 53 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph 64 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 123R -Paragraph A240 -Subparagraph f -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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