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Significant Accounting Policies (Schedule Of Redeemable Capital Shares) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Significant Accounting Policies [Abstract] |  |  |  |  |  |
Opening balance (in Shares) | 5,400,000 us-gaap_CommonStockSharesIssued |  | 5,150,000 us-gaap_CommonStockSharesIssued |  | 4,450,000 us-gaap_CommonStockSharesIssued |
Creations (in Shares) | 350,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues | [1] | 1,400,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues |  | 1,800,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues |
Redemptions (in Shares) | (550,000)us-gaap_StockRedeemedOrCalledDuringPeriodShares | [1] | (1,150,000)us-gaap_StockRedeemedOrCalledDuringPeriodShares |  | (1,100,000)us-gaap_StockRedeemedOrCalledDuringPeriodShares |
Closing balance (in Shares) | 5,200,000 us-gaap_CommonStockSharesIssued |  | 5,400,000 us-gaap_CommonStockSharesIssued |  | 5,150,000 us-gaap_CommonStockSharesIssued |
Opening balance | $ 715,960 us-gaap_CommonStockValue |  | $ 770,400 us-gaap_CommonStockValue |  | $ 607,263 us-gaap_CommonStockValue |
Creations | 47,428 us-gaap_StockIssuedDuringPeriodValueNewIssues | [1] | 210,808 us-gaap_StockIssuedDuringPeriodValueNewIssues |  | 274,782 us-gaap_StockIssuedDuringPeriodValueNewIssues |
Redemptions | (69,738)us-gaap_StockRedeemedOrCalledDuringPeriodValue | [1] | (162,799)us-gaap_StockRedeemedOrCalledDuringPeriodValue |  | (174,638)us-gaap_StockRedeemedOrCalledDuringPeriodValue |
Adjustment to redemption value |  |  | (102,449)pplt_AdjustmentOfRedeemableSharesToRedemptionValue | [1] | 62,993 pplt_AdjustmentOfRedeemableSharesToRedemptionValue | [1]
Closing balance |  |  | $ 715,960 us-gaap_CommonStockValue |  | $ 770,400 us-gaap_CommonStockValue |
Redemption value per Share at period end (in Dollars per share) |  |  | $ 132.59 pplt_RedemptionValuePerShareAtPeriodEnd |  | $ 149.59 pplt_RedemptionValuePerShareAtPeriodEnd |
[1] | Effective January 1, 2014, the Trust has adopted the provisions of Topic 946, Investment Companies, and follows specialized accounting. Refer to Note 2.1 for additional information.

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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