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Significant Accounting Policies (Schedule Of Investment In Platinum) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 oz | Dec. 31, 2013 oz | Dec. 31, 2012 oz
Significant Accounting Policies [Abstract] |  |  |  |  |  |
Opening balance (in Ounces) | 537,256.0 us-gaap_InvestmentOwnedBalanceOtherMeasure |  | 501,188.2 us-gaap_InvestmentOwnedBalanceOtherMeasure |  | 439,947.3 us-gaap_InvestmentOwnedBalanceOtherMeasure |
Creations (in Ounces) | 34,084.7 pplt_CreationsOuncesOfBullion |  | 142,164.2 pplt_CreationsOuncesOfBullion |  | 172,500.1 pplt_CreationsOuncesOfBullion |
Redemptions (in Ounces) | (53,552.5)pplt_RedemptionsOuncesOfBullion |  | (102,760.5)pplt_RedemptionsOuncesOfBullion |  | (108,337.3)pplt_RedemptionsOuncesOfBullion |
Transfers of platinum to pay expenses (in Ounces) | (3,174.0)pplt_TransfersOfBullionOunces |  | (3,335.9)pplt_TransfersOfBullionOunces |  | (2,921.9)pplt_TransfersOfBullionOunces |
Closing balance (in Ounces) | 514,614.2 us-gaap_InvestmentOwnedBalanceOtherMeasure |  | 537,256.0 us-gaap_InvestmentOwnedBalanceOtherMeasure |  | 501,188.2 us-gaap_InvestmentOwnedBalanceOtherMeasure |
Opening balance | $ 729,594 us-gaap_InvestmentInPhysicalCommodities | [1],[2] | $ 716,880 us-gaap_InvestmentInPhysicalCommodities |  | $ 607,567 us-gaap_InvestmentInPhysicalCommodities |
Creations | 47,428 pplt_CreationsValueOfBullion |  | 218,288 pplt_CreationsValueOfBullion | [3] | 267,303 pplt_CreationsValueOfBullion | [3]
Redemptions | (71,275)pplt_ValueOfBullionDistributedForRedemptionOfSharesExcludingBullionPayable |  | (149,539)pplt_ValueOfBullionDistributedForRedemptionOfSharesExcludingBullionPayable |  | (174,638)pplt_ValueOfBullionDistributedForRedemptionOfSharesExcludingBullionPayable |
Realized (loss) / gain on platinum distributed for the redemption of Shares | (1,507)pplt_RealizedGainLossOnBullionDistributedForRedemptionOfShares | [4] | 225 pplt_RealizedGainLossOnBullionDistributedForRedemptionOfShares | [5] | 20,777 pplt_RealizedGainLossOnBullionDistributedForRedemptionOfShares | [5]
Transfers of platinum to pay expenses | (4,429)pplt_CostOfBullionTransferredToPayExpenses |  | (4,989)pplt_CostOfBullionTransferredToPayExpenses |  | (4,504)pplt_CostOfBullionTransferredToPayExpenses |
Realized gain on platinum transferred to pay expenses | 113 us-gaap_GainLossOnSaleOfTrustAssetsToPayExpenses | [4] | 151 us-gaap_GainLossOnSaleOfTrustAssetsToPayExpenses | [5] | 375 us-gaap_GainLossOnSaleOfTrustAssetsToPayExpenses | [5]
Unrealized loss on investment in platinum | (77,241)pplt_ChangeInUnrealizedGainLossOnInvestmentInBullion | [4] | 0 pplt_ChangeInUnrealizedGainLossOnInvestmentInBullion | [5] | 0 pplt_ChangeInUnrealizedGainLossOnInvestmentInBullion | [5]
Realized loss on investment in platinum | 0 pplt_RealizedGainLossOnBullion | [4] | (51,422)pplt_RealizedGainLossOnBullion | [5] | 0 pplt_RealizedGainLossOnBullion | [5]
Closing balance | $ 622,683 us-gaap_InvestmentInPhysicalCommodities | [1],[4] | $ 729,594 us-gaap_InvestmentInPhysicalCommodities | [1],[2] | $ 716,880 us-gaap_InvestmentInPhysicalCommodities |
[1] | At December 31, 2014, the investment in platinum is valued at fair value. At December 31, 2013 the investment in platinum was valued at the lower of cost or market value. Refer to note 2.1 for a breakdown of cost and fair value of the investment in platinum.
[2] | Derived from audited Statement of Financial Condition as of December 31, 2013. The amounts are those previously reported under non-investment company accounting. Refer to Note 2.1 for additional information.
[3] | In accordance with Topic 946, Investment Companies, the Trust meets the exemption criteria to exclude a statement of cash flows. Thus one has not been presented for the year ended December 31, 2014. Refer to Note 2.1 for additional information.
[4] | 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.
[5] | Amounts are those previously reported under non-investment company accounting. Refer to Note 2.1 for additional information.

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