| In millions, except per share items | Jun-30-23 | Jun-30-22 | Mar-31-22 | Dec-31-21 | Sep-30-21 | Jun-30-21 | Mar-31-21 | Dec-31-20 |
| | 10-Q | 10-Q | 10-Q | 10-K | 10-Q | 10-Q | 10-Q | 10-K |
| EXPENSES | | | | | | | | |
| Sponsor's Fee | 1.5 | 1.7 | | | | | | |
| Total expenses | 1.5 | 1.7 | 1.5 | 1.5 | 1.6 | 1.5 | 1.3 | 1.2 |
| Net investment loss | -1.5 | -1.7 | -1.5 | -1.5 | -1.6 | -1.5 | -1.3 | -1.2 |
| |
| REALIZED AND UNREALIZED GAINS / (LOSSES) | | | | | | | | |
| Realized gain on Bullion transferred to pay expenses | 0.2 | 0.3 | 0.2 | | | 0.3 | 0.3 | |
| Realized gain on Bullion distributed for the redemption of Shares | 1.2 | 1.5 | 0.5 | 1.4 | 4.7 | | 8.7 | |
| Change in unrealized (loss) on investment in Bullion | -58.4 | -131.0 | | | | | | |
| Total (loss) on investment in Bullion | -57.1 | -129.2 | | | | | | |
| Change in net assets from operations | -58.6 | -130.9 | 74.4 | 39.7 | -112.6 | 31.3 | -57.8 | 28.6 |
| |
| Net increase / (decrease) in net assets per Share | ($5.17) | ($10.52) | $6.66 | $4.13 | ($10.07) | $3.12 | ($6.34) | $3.24 |
| |
| Weighted average number of Shares | 11.3 | 12.4 | 11.2 | 10.3 | 11.2 | 10.0 | 9.1 | 7.2 |