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Share-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2019
Share Based Compensation [Abstract] |
Summary of Restricted Stock and Performance Unit Award Activity | The following table presents restricted stock and performance unit award activity for the three months ended March 31, 2019:
|  | Restricted Stock |  |  | Performance Units |
|  | Shares |  |  | Weighted Average Grant- Date Fair Value |  |  | Shares |  |  | Weighted Average Grant- Date Fair Value |
Outstanding at January 1, 2019 |  |  | 743,591 |  |  | $ | 86.90 |  |  |  | 266,704 |  |  | $ | 90.01 |
Vested |  |  | (699 | ) |  |  | 80.75 |  |  |  | — |  |  |  | — |
Forfeitures |  |  | (2,720 | ) |  |  | 91.44 |  |  |  | — |  |  |  | — |
Outstanding at March 31, 2019 |  |  | 740,172 |  |  | $ | 86.89 |  |  |  | 266,704 |  |  | $ | 90.01 |
Compensation Expense for Share-Based Awards | Our share-based compensation expense is recorded in "Selling, general, and administrative expenses." Compensation expense for share-based awards recognized in the Consolidated Statements of Income, net of forfeitures, was as follows (dollars in millions):
|  | Three Months Ended March 31, |
|  | 2019 |  |  | 2018 |
Restricted stock |  | $ | 4.9 |  |  | $ | 3.9 |
Performance units |  |  | 2.0 |  |  |  | 1.2 |
Total share-based compensation expense |  |  | 6.9 |  |  |  | 5.1 |
Income tax benefit |  |  | (1.7 | ) |  |  | (1.3 | )
Share-based compensation expense, net of tax benefit |  | $ | 5.2 |  |  | $ | 3.8 |
Unrecognized Compensation Expense for Share-Based Awards | The unrecognized compensation expense for all share-based awards at March 31, 2019 was as follows (dollars in millions):
|  | March 31, 2019 |
|  | Unrecognized Compensation Expense |  |  | Remaining Weighted Average Recognition Period (in years) |
Restricted stock |  | $ | 26.6 |  |  | 2.3 |
Performance units |  |  | 12.5 |  |  |  | 2.4 |
Total unrecognized share-based compensation expense |  | $ | 39.1 |  |  |  | 2.3 |

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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 Tabular disclosure of the changes in outstanding nonvested shares. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the total compensation cost related to nonvested awards not yet recognized and the weighted-average period over which it is expected to be recognized. + 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 (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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