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Share-based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2015
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, 2015:
| Restricted Stock |  | Performance Units
| Shares |  | Weighted Average Grant- Date Fair Value |  | Shares |  | Weighted Average Grant- Date Fair Value
Outstanding at January 1, 2015 | 1,184,299 |  |  | $ | 41.71 |  |  | 127,489 |  |  | $ | 58.25 |
Granted | 205,462 |  |  | 65.25 |  |  | 47,512 |  |  | 65.17 |
Vested | (349,451 | ) |  | 29.37 |  |  | — |  |  | — |
Forfeitures | (4,537 | ) |  | 65.79 |  |  | — |  |  | — |
Outstanding at June 30, 2015 | 1,035,773 |  |  | $ | 49.82 |  |  | 175,001 |  |  | $ | 60.13 |
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 June 30 |  | Six Months Ended June 30
| 2015 |  | 2014 |  | 2015 |  | 2014
Restricted stock | $ | 4.4 |  |  | $ | 3.7 |  |  | $ | 8.0 |  |  | $ | 7.0 |
Performance units | 0.5 |  |  | 0.3 |  |  | 1.1 |  |  | 0.6 |
Total share-based compensation expense | 4.9 |  |  | 4.0 |  |  | 9.1 |  |  | 7.6 |
Income tax benefit | (1.9 | ) |  | (1.6 | ) |  | (3.5 | ) |  | (3.0 | )
Share-based compensation expense, net of tax benefit | $ | 3.0 |  |  | $ | 2.4 |  |  | $ | 5.6 |  |  | $ | 4.6 |
Unrecognized Compensation For Restricted Stock and Performance Units | The unrecognized compensation expense for all share-based awards at June 30, 2015, was as follows (dollars in millions):
| June 30, 2015
| Unrecognized Compensation Expense |  | Remaining Weighted Average Recognition Period (in years)
Restricted stock | $ | 33.0 |  |  | 2.9
Performance units | 7.5 |  |  | 3.2
Total unrecognized share-based compensation expense | $ | 40.5 |  |  | 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=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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