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Accrued Liabilities (Details) - USD ($)
$ in Millions
Jan. 31, 2020
Jan. 31, 2019
Accrued Liabilities    
Accrued salaries, vacation and related benefits $ 13.9 $ 13.9
Accrued interest 7.2 7.2
Accrued incentive compensation 2.3 9.1
Accrued property taxes 2.3 1.9
Other accrued liabilities 7.7 5.8
Total accrued liabilities $ 26.2 $ 30.7