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STOCK-BASED COMPENSATION | 6 Months Ended
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Jun. 30, 2014
STOCK-BASED COMPENSATION |
STOCK-BASED COMPENSATION | 12. STOCK-BASED COMPENSATION We grant various types of share-based payment awards to participants, including restricted stock unit awards and stock option grants. The key terms of our restricted stock unit awards and our stock option grants, including all financial disclosures, are set forth in our Annual Report on Form 10-K for the year ended December 31, 2013. Information regarding our stock-based compensation expense for the three and six month periods ended June 30, 2014 are as follows:
|  | Three Months Ended June 30, |  | Six Months Ended June 30, |
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(In millions) |  | 2014 |  | 2013 |  | 2014 |  | 2013 |
Stock based compensation expense |  | $ | 4.3 |  | $ | 2.6 |  | $ | 7.1 |  | $ | 4.5 |
Income tax provision related to stock compensation expense |  |  | (1.5 | ) |  | (0.9 | ) |  | (2.5 | ) |  | (1.5 | )
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After tax share based compensation expense |  | $ | 2.8 |  | $ | 1.7 |  | $ | 4.6 |  | $ | 3.0 |
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In computing diluted earnings per share for the three and six months ended June 30, 2014, common stock equivalents of 0.6 million and 0.3 million shares were not included due to their anti-dilutive effect. For both the three and six months ended June 30, 2013, common stock equivalents of 0.1 million shares were not included due to their anti-dilutive effect. Certain of our restricted stock units participate in dividend distributions, however, the distributions for these restricted stock units do not have a material impact on our earnings per share calculation.

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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://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=6415400&loc=d3e5047-113901 Reference 2: 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=6415400&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 + Details
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