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Share-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2018
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, 2018:
|  | Restricted Stock |  |  | Performance Units |
|  | Shares |  |  | Weighted Average Grant- Date Fair Value |  |  | Shares |  |  | Weighted Average Grant- Date Fair Value |
Outstanding at January 1, 2018 |  |  | 739,732 |  |  | $ | 77.23 |  |  |  | 226,558 |  |  | $ | 77.07 |
Granted |  |  | 173,144 |  |  |  | 114.63 |  |  |  | 87,022 |  |  |  | 115.33 |
Vested |  |  | (159,316 | ) |  |  | 67.25 |  |  |  | (46,876 | ) |  |  | 74.46 |
Forfeitures |  |  | (2,761 | ) |  |  | 80.10 |  |  |  | — |  |  |  | — |
Outstanding at June 30, 2018 |  |  | 750,799 |  |  | $ | 87.96 |  |  |  | 266,704 |  |  | $ | 90.01 |
Compensation Expense For Restricted Stock and Performance Units | 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, |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
Restricted stock |  | $ | 5.0 |  |  | $ | 4.1 |  |  | $ | 8.9 |  |  | $ | 7.5 |
Performance units |  |  | 0.6 |  |  |  | 1.5 |  |  |  | 1.8 |  |  |  | 2.7 |
Total share-based compensation expense |  |  | 5.6 |  |  |  | 5.6 |  |  |  | 10.7 |  |  |  | 10.2 |
Income tax benefit |  |  | (1.4 | ) |  |  | (2.1 | ) |  |  | (2.7 | ) |  |  | (3.9 | )
Share-based compensation expense, net of tax benefit |  | $ | 4.2 |  |  | $ | 3.5 |  |  | $ | 8.0 |  |  | $ | 6.3 |
Unrecognized Compensation For Restricted Stock and Performance Units | The unrecognized compensation expense for all share-based awards at June 30, 2018 was as follows (dollars in millions):
|  | June 30, 2018 |
|  | Unrecognized Compensation Expense |  |  | Remaining Weighted Average Recognition Period (in years) |
Restricted stock |  | $ | 41.4 |  |  | 2.7 |
Performance units |  |  | 17.3 |  |  |  | 3.0 |
Total unrecognized share-based compensation expense |  | $ | 58.7 |  |  |  | 2.8 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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