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Stock-Based Compensation Plans | 6 Months Ended
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Jun. 30, 2016
Share-based Compensation [Abstract] |
Stock-Based Compensation Plans | STOCK-BASED COMPENSATION PLANS Stock-based compensation expense consists of the following:
(In millions) |  | For the Three Months Ended June 30, |  | For the Six Months Ended June 30,
|  | 2016 |  | 2015 |  | 2016 |  | 2015
Restricted stock |  | $ | 0.7 |  |  | $ | 0.7 |  |  | $ | 1.4 |  |  | $ | 1.7 |
Restricted stock units |  | 1.0 |  |  | 1.9 |  |  | 2.4 |  |  | 5.0 |
Total |  | $ | 1.7 |  |  | $ | 2.6 |  |  | $ | 3.8 |  |  | $ | 6.7 |
A summary of the non-vested restricted stock activity is presented below:
Restricted Stock |  | Number of Shares |  | Weighted Average Grant-Date Fair Value Per Share
Non-vested as of December 31, 2015 |  | 182,311 |  |  | $ | 109.17 |
Granted |  | 7,657 |  |  | 196.96 |
Vested |  | (20,408 | ) |  | 115.74 |
Forfeited |  | (395 | ) |  | 187.17 |
Non-vested as of June 30, 2016 |  | 169,165 |  |  | $ | 112.17 |
A summary of the restricted stock unit activity is presented below:
Restricted Stock Units |  | Number of Restricted Stock Units |  | Weighted Average Grant-Date Fair Value Per Share
Outstanding as of December 31, 2015 |  | 859,419 |  |  | $ | 61.73 |
Granted |  | 250 |  |  | 178.96 |
Converted |  | (404,096 | ) |  | 16.73 |
Outstanding as of June 30, 2016 |  | 455,573 |  |  | $ | 101.70 |

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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 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 Reference 2: 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=51659978&loc=d3e25284-112666 Reference 3: 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 4: 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 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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