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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block] | The following table summarizes the Company's pre-tax compensation expense and related income tax benefit during the three months ended March 31, 2018 and 2017 related to the Company's performance units and restricted stock.
| Three Months Ended March 31,
(In millions) | 2018 | 2017
Performance units: |  |
Total shareholder return | $ | 2.0 |  | $ | 1.5 |
Earnings per share | 0.7 |  | 0.6 |
Total performance units | 2.7 |  | 2.1 |
Restricted stock | — |  | — |
Total compensation expense | $ | 2.7 |  | $ | 2.1 |
Income tax benefit | $ | 0.7 |  | $ | 0.8 |
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] | The following table summarizes the Company's stock-based compensation grants during the three months ended March 31, 2018.
| Units/Shares | Fair Value Per Share
Grants: |  |
Performance units (Total shareholder return) | 261,916 |  | $ | 36.86 |
Performance units (Earnings per share) | 87,308 |  | $ | 31.03 |

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + 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=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 + Details
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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=96867065&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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