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Share-Based Compensation (Tables) | 9 Months Ended
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Sep. 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 nine months ended September 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 |  |  | (209,687 | ) |  |  | 68.21 |  |  |  | (59,165 | ) |  |  | 67.84 |
Forfeitures |  |  | (8,836 | ) |  |  | 100.69 |  |  |  | — |  |  |  | — |
Outstanding at September 30, 2019 |  |  | 724,253 |  |  | $ | 94.50 |  |  |  | 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 September 30, |  |  | Nine Months Ended September 30, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Restricted stock |  | $ | 3.5 |  |  | $ | 4.9 |  |  | $ | 19.1 |  |  | $ | 13.9 |
Performance units |  |  | 2.4 |  |  |  | 1.7 |  |  |  | 5.4 |  |  |  | 3.5 |
Total share-based compensation expense |  |  | 5.9 |  |  |  | 6.6 |  |  |  | 24.5 |  |  |  | 17.4 |
Income tax benefit |  |  | (1.5 | ) |  |  | (1.6 | ) |  |  | (6.2 | ) |  |  | (4.4 | )
Share-based compensation expense, net of tax benefit |  | $ | 4.4 |  |  | $ | 5.0 |  |  | $ | 18.3 |  |  | $ | 13.0 |
Unrecognized Compensation Expense for Share-Based Awards | The unrecognized compensation expense for all share-based awards at September 30, 2019 was as follows (dollars in millions):
|  | September 30, 2019 |
|  | Unrecognized Compensation Expense |  |  | Remaining Weighted Average Recognition Period (in years) |
Restricted stock |  | $ | 31.0 |  |  |  | 3.0 |
Performance units |  |  | 19.4 |  |  |  | 2.6 |
Total unrecognized share-based compensation expense |  | $ | 50.4 |  |  |  | 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=116856206&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=116856206&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=116856206&loc=d3e5070-113901 + Details
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