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Contingencies (Details) £ in Millions, $ in Millions |  |  | 6 Months Ended | 26 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 19, 2018 GBP (£) | Dec. 20, 2017 GBP (£) | Apr. 30, 2018 GBP (£) | Apr. 30, 2017 action | Jul. 31, 2017 USD ($)
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Number of putative class action complaints filed (over) | action |  |  |  | 50 |
Litigation Settlement, Amount | $ |  |  |  |  | $ 3.0
UNITED KINGDOM |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Diverted profit tax |  | £ 31.0 | £ 31.0 |  |
Payment for DPT | £ 31.0 |  |  |  |

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