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Schedule of Investments (oz, USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Investment Holdings [Line Items]    
Investment in Platinum (oz) 514,614.2us-gaap_InvestmentOwnedBalanceOtherMeasure 537,256.0us-gaap_InvestmentOwnedBalanceOtherMeasure
Cost $ 699,924us-gaap_InvestmentOwnedAtCost $ 729,594us-gaap_InvestmentOwnedAtCost
Fair Value 622,683us-gaap_InvestmentOwnedAtFairValue 729,594us-gaap_InvestmentOwnedAtFairValue
% of Net Assets 101.98%us-gaap_InvestmentOwnedPercentOfNetAssets [1] 101.90%us-gaap_InvestmentOwnedPercentOfNetAssets [2]
Platinum [Member]    
Investment Holdings [Line Items]    
Investment in Platinum (oz) 514,614.2us-gaap_InvestmentOwnedBalanceOtherMeasure
/ us-gaap_CurrencyAxis
= currency_XPT		 537,256.0us-gaap_InvestmentOwnedBalanceOtherMeasure
/ us-gaap_CurrencyAxis
= currency_XPT
Cost 699,924us-gaap_InvestmentOwnedAtCost
/ us-gaap_CurrencyAxis
= currency_XPT		 729,594us-gaap_InvestmentOwnedAtCost
/ us-gaap_CurrencyAxis
= currency_XPT
Fair Value $ 622,683us-gaap_InvestmentOwnedAtFairValue
/ us-gaap_CurrencyAxis
= currency_XPT		 $ 729,594us-gaap_InvestmentOwnedAtFairValue
/ us-gaap_CurrencyAxis
= currency_XPT
% of Net Assets 101.98%us-gaap_InvestmentOwnedPercentOfNetAssets
/ us-gaap_CurrencyAxis
= currency_XPT		 [1] 101.90%us-gaap_InvestmentOwnedPercentOfNetAssets
/ us-gaap_CurrencyAxis
= currency_XPT		 [2]
[1] Calculated as investment in platinum at fair value divided by net assets, as at December 31, 2014, investment in platinum is recorded at fair value. Refer to Note 2.1 for additional information.
[2] Calculated as investment in platinum at cost divided by net assets, as at December 31, 2013, investment in platinum was recorded at the lower of cost or market value. Refer to Note 2.1 for additional information.