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Significant Accounting Policies (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Significant Accounting Policies [Abstract]      
Minimum block of shares issued redeemed against platinum 50,000pplt_MinimumBlockOfSharesIssuedRedeemedAgainstBullion    
Annualized rate of Sponsors Fee 0.60%pplt_AnnualizedRateOfSponsorsFee [1]    
Sponsor Fees $ 4,376,182us-gaap_SponsorFees $ 4,973,343us-gaap_SponsorFees $ 4,588,610us-gaap_SponsorFees
Fees payable to Sponsor $ 320,608us-gaap_AccountsPayableRelatedPartiesCurrent $ 373,364us-gaap_AccountsPayableRelatedPartiesCurrent  
[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.