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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 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 and six months ended June 30, 2018 and 2017 related to the Company's performance units and restricted stock.
| Three Months Ended June 30, | Six Months Ended June 30,
(In millions) | 2018 | 2017 | 2018 | 2017
Performance units: |  |  |  |
Total shareholder return | $ | 2.1 |  | $ | 1.8 |  | $ | 4.1 |  | $ | 3.3 |
Earnings per share | 1.0 |  | 0.6 |  | 1.7 |  | 1.2 |
Total performance units | 3.1 |  | 2.4 |  | 5.8 |  | 4.5 |
Restricted stock | — |  | — |  | — |  | — |
Total compensation expense | $ | 3.1 |  | $ | 2.4 |  | $ | 5.8 |  | $ | 4.5 |
Income tax benefit | $ | 0.8 |  | $ | 1.0 |  | $ | 1.5 |  | $ | 1.8 |

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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 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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