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Share-Based Compensation - Summary of Restricted Stock and Performance Units Activity (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Restricted Stock |  |  |  |
Restricted Stock and Performance Unit Activity [Roll Forward] |  |  |  |
Outstanding at January 1 |  | 1,007,794 | 1,184,299 | 1,463,694
Granted |  | 242,835 | 218,957 | 229,489
Vested |  | (443,627) | (389,481) | (507,222)
Forfeitures |  | (20,923) | (5,981) | (1,662)
Outstanding at December 31 |  | 786,079 | 1,007,794 | 1,184,299
Restricted Stock and Performance Unit Activity (Weighted Average Grant-date Fair Value) [Abstract] |  |  |  |
Weighted average grant-date fair value, Outstanding at January 1 |  | $ 49.47 | $ 41.71 | $ 31.48
Weighted average grant-date fair value, Granted |  | 67.48 | 65.16 | 70.24
Weighted average grant-date fair value, Vested |  | 34.11 | 32.77 | 26.29
Weighted average grant-date fair value, Forfeitures |  | 59.63 | 66.42 | 61.05
Weighted average grant-date fair value, Outstanding at December 31 |  | $ 63.44 | $ 49.47 | $ 41.71
Fair value of awards vested |  | $ 28.8 | $ 26.3 | $ 36.4
Performance Units |  |  |  |
Restricted Stock and Performance Unit Activity [Roll Forward] |  |  |  |
Outstanding at January 1 |  | 175,675 | 127,489 | 70,600
Granted |  | 77,017 | 53,102 | 56,889
Vested | [1] | (20,604) | (4,916) | 0
Outstanding at December 31 |  | 232,088 | 175,675 | 127,489
Restricted Stock and Performance Unit Activity (Weighted Average Grant-date Fair Value) [Abstract] |  |  |  |
Weighted average grant-date fair value, Outstanding at January 1 |  | $ 59.94 | $ 58.25 | $ 47.83
Weighted average grant-date fair value, Granted |  | 67.57 | 65.04 | 71.19
Weighted average grant-date fair value, Vested | [1] | 57.58 | 71.19 | 0.00
Weighted average grant-date fair value, Outstanding at December 31 |  | $ 62.68 | $ 59.94 | $ 58.25
Fair value of awards vested |  | $ 1.1 |  |
[1] | The total fair value of awards upon vesting for the year ended December 31, 2016 was $1.1 million. Upon vesting of the awards, PCA issued 21,111 shares of its common stock, which included 507 shares for dividends accrued during the vesting period.

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(iii)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + 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)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + 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 (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + 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)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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