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Share-based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2016
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 three months ended March 31, 2016:
| Restricted Stock |  | Performance Units
| Shares |  | Weighted Average Grant- Date Fair Value |  | Shares |  | Weighted Average Grant- Date Fair Value
Outstanding at January 1, 2016 | 1,007,794 |  |  | $ | 49.47 |  |  | 175,675 |  |  | $ | 59.94 |
Granted | 321 |  |  | 62.35 |  |  | — |  |  | — |
Vested (a) | (74,444 | ) |  | 46.05 |  |  | (20,604 | ) |  | 57.58 |
Forfeitures | (9,152 | ) |  | 59.46 |  |  | — |  |  | — |
Outstanding at March 31, 2016 | 924,519 |  |  | $ | 49.66 |  |  | 155,071 |  |  | $ | 60.25 |
Compensation Expense for Restricted Stock and Performance Units | 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 March 31
| 2016 |  | 2015
Restricted stock | $ | 4.9 |  |  | $ | 3.6 |
Performance units | 0.7 |  |  | 0.6 |
Total share-based compensation expense | 5.6 |  |  | 4.2 |
Income tax benefit | (2.2 | ) |  | (1.6 | )
Share-based compensation expense, net of tax benefit | $ | 3.4 |  |  | $ | 2.6 |
Unrecognized Compensation For Restricted Stock and Performance Units | The unrecognized compensation expense for all share-based awards at March 31, 2016 was as follows (dollars in millions):
| March 31, 2016
| Unrecognized Compensation Expense |  | Remaining Weighted Average Recognition Period (in years)
Restricted stock | $ | 22.1 |  |  | 2.4
Performance units | 5.4 |  |  | 2.6
Total unrecognized share-based compensation expense | $ | 27.5 |  |  | 2.4

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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=6415400&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=6415400&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=6415400&loc=d3e5070-113901 + Details
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