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Accounts receivable - Past Due Status (Details) $ in Millions | Oct. 31, 2020 USD ($)
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Financing Receivable, Past Due [Line Items] |
Current | $ 47.6
Total at amortized cost | 54.2
1 - 30 days past due |
Financing Receivable, Past Due [Line Items] |
Financing receivable, past due | 4.0
31 - 60 days past due |
Financing Receivable, Past Due [Line Items] |
Financing receivable, past due | 1.5
61 - 90 days past due |
Financing Receivable, Past Due [Line Items] |
Financing receivable, past due | 0.7
Greater than 90 days past due |
Financing Receivable, Past Due [Line Items] |
Financing receivable, past due | $ 0.4

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