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Share-based Compensation (Tables) | 6 Months Ended
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Jun. 30, 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 six months ended June 30, 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 | 242,835 |  |  | 67.48 |  |  | 77,017 |  |  | 67.57 |
Vested (a) | (409,815 | ) |  | 32.64 |  |  | (20,604 | ) |  | 57.58 |
Forfeitures | (14,440 | ) |  | 56.69 |  |  | — |  |  | — |
Outstanding at June 30, 2016 | 826,374 |  |  | $ | 62.99 |  |  | 232,088 |  |  | $ | 62.68 |
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(a) | Upon vesting of the performance unit awards, PCA issued 21,111 shares of its common stock, which included 507 shares for dividends accrued during the vesting period.
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
| 2016 |  | 2015 |  | 2016 |  | 2015
Restricted stock | $ | 3.9 |  |  | $ | 4.4 |  |  | $ | 8.8 |  |  | $ | 8.0 |
Performance units | 0.8 |  |  | 0.5 |  |  | 1.5 |  |  | 1.1 |
Total share-based compensation expense | 4.7 |  |  | 4.9 |  |  | 10.3 |  |  | 9.1 |
Income tax benefit | (1.8 | ) |  | (1.9 | ) |  | (4.0 | ) |  | (3.5 | )
Share-based compensation expense, net of tax benefit | $ | 2.9 |  |  | $ | 3.0 |  |  | $ | 6.3 |  |  | $ | 5.6 |
Unrecognized Compensation For Restricted Stock and Performance Units | The unrecognized compensation expense for all share-based awards at June 30, 2016 was as follows (dollars in millions):
| June 30, 2016
| Unrecognized Compensation Expense |  | Remaining Weighted Average Recognition Period (in years)
Restricted stock | $ | 34.4 |  |  | 3.0
Performance units | 10.0 |  |  | 3.2
Total unrecognized share-based compensation expense | $ | 44.4 |  |  | 3.1

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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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