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Stock-Based Compensation | 6 Months Ended
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Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Disclosure of Compensation Related Costs, Share-based Payments [Text Block] | Stock-Based Compensation 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 |
During the three and six months ended June 30, 2018, the Company issued an immaterial number of shares of new common stock pursuant to the Company's Stock Incentive Plan to satisfy restricted stock grants and payouts of earned performance units.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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