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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
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, 2015 and 2014 related to the Company's performance units and restricted stock.
| Three Months Ended June 30, | Six Months Ended June 30,
(In millions) | 2015 | 2014 | 2015 | 2014
Performance units |  |  |  |
Total shareholder return | $ | 1.9 |  | $ | 1.9 |  | $ | 3.8 |  | $ | 3.9 |
Earnings per share | 0.6 |  | 0.4 |  | 1.1 |  | 2.1 |
Total performance units | 2.5 |  | 2.3 |  | 4.9 |  | 6.0 |
Restricted stock | 0.1 |  | — |  | 0.1 |  | 0.1 |
Total compensation expense | 2.6 |  | 2.3 |  | 5.0 |  | 6.1 |
Less: Amount paid by unconsolidated affiliates | 0.2 |  | 0.7 |  | 0.5 |  | 1.9 |
Net compensation expense | $ | 2.4 |  | $ | 1.6 |  | $ | 4.5 |  | $ | 4.2 |
Income tax benefit | $ | 1.0 |  | $ | 0.6 |  | $ | 1.8 |  | $ | 1.6 |

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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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