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Share-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2020
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, 2020:
|  | Restricted Stock |  |  | Performance Units |
|  | Shares |  |  | Weighted Average Grant- Date Fair Value |  |  | Shares |  |  | Weighted Average Grant- Date Fair Value |
Outstanding at January 1, 2020 |  |  | 716,952 |  |  | $ | 94.50 |  |  |  | 323,147 |  |  | $ | 96.56 |
Granted |  |  | 204,960 |  |  |  | 94.25 |  |  |  | 120,285 |  |  |  | 99.16 |
Vested |  |  | (241,714 | ) |  |  | 71.82 |  |  |  | (86,015 | ) |  |  | 70.81 |
Forfeitures |  |  | (3,666 | ) |  |  | 96.60 |  |  |  | — |  |  |  | — |
Outstanding at June 30, 2020 |  |  | 676,532 |  |  | $ | 102.52 |  |  |  | 357,417 |  |  | $ | 103.63 |
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, |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Restricted stock |  | $ | 5.6 |  |  | $ | 10.8 |  |  | $ | 13.6 |  |  | $ | 15.7 |
Performance units |  |  | 2.1 |  |  |  | 0.9 |  |  |  | 4.2 |  |  |  | 2.9 |
Total share-based compensation expense |  |  | 7.7 |  |  |  | 11.7 |  |  |  | 17.8 |  |  |  | 18.6 |
Income tax benefit |  |  | (1.9 | ) |  |  | (3.0 | ) |  |  | (4.5 | ) |  |  | (4.7 | )
Share-based compensation expense, net of tax benefit |  | $ | 5.8 |  |  | $ | 8.7 |  |  | $ | 13.3 |  |  | $ | 13.9 |
Unrecognized Compensation Expense for Share-Based Awards | The unrecognized compensation expense for all share-based awards at June 30, 2020 was as follows (dollars in millions):
|  | June 30, 2020 |
|  | Unrecognized Compensation Expense |  |  | Remaining Weighted Average Recognition Period (in years) |
Restricted stock |  | $ | 32.6 |  |  |  | 3.1 |
Performance units |  |  | 22.9 |  |  |  | 2.6 |
Total unrecognized share-based compensation expense |  | $ | 55.5 |  |  |  | 2.9 |

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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + 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=120381028&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=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of cost not yet recognized and weighted-average period over which cost is expected to be recognized for nonvested award under share-based payment arrangement. + 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=120381028&loc=d3e5070-113901 + Details
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