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Employee Stock and Incentive Plans (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
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 | 2018 |  | 2017 |  | 2016 |
Millions |  |  |
Performance Shares |  | $2.3 |  |  | $2.1 |  |  | $1.8 |
Restricted Stock Units | 0.9 |  | 1.0 |  | 0.8 |
Total Share-Based Compensation Expense |  | $3.2 |  |  | $3.1 |  |  | $2.6 |
Income Tax Benefit |  | $0.9 |  |  | $0.9 |  |  | $1.1 |
Performance Shares [Table Text Block] | Performance Shares. The following table presents information regarding our non-vested performance shares.
| 2018 | 2017 | 2016
| 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 | 127,898 |  |  | $58.23 |  | 127,580 |  |  | $52.56 |  | 119,540 |  |  | $52.72 |
Granted (a) | 66,557 |  |  | $76.42 |  | 50,729 |  |  | $62.90 |  | 57,189 |  |  | $52.43 |
Awarded | (58,293 | ) | $59.82 | — |  | — |  | — |  | — |
Unearned Grant Award | — |  | — |  | (40,801 | ) |  | $46.27 |  | (42,126 | ) |  | $52.70 |
Forfeited | (6,469 | ) |  | $72.99 |  | (9,610 | ) |  | $58.29 |  | (7,023 | ) |  | $53.45 |
Non-vested as of December 31 | 129,693 |  |  | $66.12 |  | 127,898 |  |  | $58.23 |  | 127,580 |  |  | $52.56 |
(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.
| 2018 | 2017 | 2016
| 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 | 55,248 |  |  | $56.18 |  | 54,728 |  |  | $51.79 |  | 57,694 |  |  | $49.86 |
Granted (a) | 16,573 |  |  | $71.11 |  | 21,241 |  |  | $62.20 |  | 20,351 |  |  | $50.25 |
Awarded | (18,881 | ) |  | $55.78 |  | (17,281 | ) |  | $49.72 |  | (19,661 | ) |  | $44.33 |
Forfeited | (3,169 | ) |  | $64.92 |  | (3,440 | ) |  | $56.00 |  | (3,656 | ) |  | $52.87 |
Available as of December 31 | 49,771 |  |  | $60.74 |  | 55,248 |  |  | $56.18 |  | 54,728 |  |  | $51.79 |
(a) Shares granted include 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + 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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