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Contingencies (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Apr. 30, 2020
Apr. 30, 2019
Apr. 30, 2018
Apr. 24, 2018
Apr. 30, 2021
Mar. 31, 2021
Dec. 31, 2018
Loss Contingencies [Line Items]              
Loss contingency, possible loss suspension           $ 15.0  
Civil Penalty              
Loss Contingencies [Line Items]              
Litigation settlement payment $ 3.5 $ 3.5 $ 1.0        
Loss contingency accrual           7.0 $ 15.0
Civil Penalty | BIS [Member]              
Loss Contingencies [Line Items]              
Loss contingency, estimate of possible loss           0.3  
Civil Penalty | Other Current Liabilities              
Loss Contingencies [Line Items]              
Loss contingency accrual           3.5  
Civil Penalty | Other Noncurrent Liabilities              
Loss Contingencies [Line Items]              
Loss contingency accrual           3.5  
Civil Penalty | Maximum              
Loss Contingencies [Line Items]              
Loss contingency, estimate of possible loss       $ 30.0      
Loss contingency, possible loss suspension       $ 15.0      
Merger related [Member]              
Loss Contingencies [Line Items]              
Litigation Settlement, Amount Awarded to Other Party           $ 0.4  
Subsequent Event | Civil Penalty              
Loss Contingencies [Line Items]              
Litigation settlement payment         $ 3.5