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Share-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2017
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, 2017:
|  | Restricted Stock |  |  | Performance Units |
|  | Shares |  |  | Weighted Average Grant- Date Fair Value |  |  | Shares |  |  | Weighted Average Grant- Date Fair Value |
Outstanding at January 1, 2017 |  |  | 786,079 |  |  | $ | 63.44 |  |  |  | 232,088 |  |  | $ | 62.68 |
Granted |  |  | 173,199 |  |  |  | 107.57 |  |  |  | 61,861 |  |  |  | 108.19 |
Vested |  |  | (206,707 | ) |  |  | 51.05 |  |  |  | (67,391 | ) |  |  | 56.08 |
Forfeitures |  |  | (4,341 | ) |  |  | 65.51 |  |  |  | — |  |  |  | — |
Outstanding at June 30, 2017 |  |  | 748,230 |  |  | $ | 77.07 |  |  |  | 226,558 |  |  | $ | 77.07 |
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, |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Restricted stock |  | $ | 4.1 |  |  | $ | 3.9 |  |  | $ | 7.5 |  |  | $ | 8.8 |
Performance units |  |  | 1.5 |  |  |  | 0.8 |  |  |  | 2.7 |  |  |  | 1.5 |
Total share-based compensation expense |  |  | 5.6 |  |  |  | 4.7 |  |  |  | 10.2 |  |  |  | 10.3 |
Income tax benefit |  |  | (2.1 | ) |  |  | (1.8 | ) |  |  | (3.9 | ) |  |  | (4.0 | )
Share-based compensation expense, net of tax benefit |  | $ | 3.5 |  |  | $ | 2.9 |  |  | $ | 6.3 |  |  | $ | 6.3 |
Unrecognized Compensation For Restricted Stock and Performance Units | The unrecognized compensation expense for all share-based awards at June 30, 2017 was as follows (dollars in millions):
|  | June 30, 2017 |
|  | Unrecognized Compensation Expense |  |  | Remaining Weighted Average Recognition Period (in years) |
Restricted stock |  | $ | 38.2 |  |  | 2.9 |
Performance units |  |  | 12.0 |  |  | 3.2 |
Total unrecognized share-based compensation expense |  | $ | 50.2 |  |  |  | 3.0 |

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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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