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Commitments and contingencies: Current and potential litigation (Details) - USD ($)
$ in Millions
12 Months Ended
Oct. 25, 2021
Dec. 31, 2021
Mar. 31, 2015
Commitments and contingencies      
Estimate of possible loss in excess of accrual   $ 3.6  
Alleged unpaid fees   $0.6  
Loss contingency, damages awarded, value   $ 0.7  
Losses on lease terminations   $ 7.4  
Spain      
Commitments and contingencies      
Estimate of possible loss     $ 9.0
CIMA      
Commitments and contingencies      
Loss contingency, damages awarded, value $ 0.7