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Acquisitions (Cumberland Narrative) (Details) - Cumberland Asset Acquisition
$ in Millions, $ in Millions
12 Months Ended
Jan. 31, 2019
USD ($)
Jan. 31, 2019
AUD ($)
Dec. 31, 2019
USD ($)
Business Acquisition [Line Items]      
Payments to acquire business $ 6.0 $ 8.2  
SG&A Expenses      
Business Acquisition [Line Items]      
Transaction costs     $ 0.1