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Share-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 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 six months ended June 30, 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 |
Granted |  |  | 199,185 |  |  |  | 95.45 |  |  |  | 115,608 |  |  |  | 96.98 |
Vested |  |  | (198,292 | ) |  |  | 67.62 |  |  |  | (59,165 | ) |  |  | 67.84 |
Forfeitures |  |  | (6,530 | ) |  |  | 102.74 |  |  |  | — |  |  |  | — |
Outstanding at June 30, 2019 |  |  | 737,954 |  |  | $ | 94.25 |  |  |  | 323,147 |  |  | $ | 96.56 |
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 June 30, |  |  | Six Months Ended June 30, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Restricted stock |  | $ | 10.8 |  |  | $ | 5.0 |  |  | $ | 15.7 |  |  | $ | 8.9 |
Performance units |  |  | 0.9 |  |  |  | 0.6 |  |  |  | 2.9 |  |  |  | 1.8 |
Total share-based compensation expense |  |  | 11.7 |  |  |  | 5.6 |  |  |  | 18.6 |  |  |  | 10.7 |
Income tax benefit |  |  | (3.0 | ) |  |  | (1.4 | ) |  |  | (4.7 | ) |  |  | (2.7 | )
Share-based compensation expense, net of tax benefit |  | $ | 8.7 |  |  | $ | 4.2 |  |  | $ | 13.9 |  |  | $ | 8.0 |
Unrecognized Compensation Expense for Share-Based Awards | The unrecognized compensation expense for all share-based awards at June 30, 2019 was as follows (dollars in millions):
|  | June 30, 2019 |
|  | Unrecognized Compensation Expense |  |  | Remaining Weighted Average Recognition Period (in years) |
Restricted stock |  | $ | 34.7 |  |  | 2.9 |
Performance units |  |  | 21.6 |  |  |  | 2.8 |
Total unrecognized share-based compensation expense |  | $ | 56.3 |  |  |  | 2.9 |

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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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