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Related-Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018	Jan. 31, 2019
Related-Party Transactions (Details) [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party	$ 6.7
Refined Coal [Member]
Related-Party Transactions (Details) [Line Items]
Payments for Commissions	0.2	$ 0.4	$ 0.6	$ 0.7
Accrued Liabilities for Commissions, Expense and Taxes	0.7		0.7		$ 1.6
One Earth Energy And Nu Gen Energy [Member]
Related-Party Transactions (Details) [Line Items]
Costs and Expenses, Related Party	58.5	$ 47.3	148.7	$ 138.6
Accounts Payable, Related Parties, Current	$ 0.1		$ 0.1		$ 1.9

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Amount for accounts payable to related parties. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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The carrying amount for commissions, taxes and other expenses that were incurred but unpaid as of the balance sheet date.

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The amount of cash paid for commissions during the current period.

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Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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