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Financial instruments - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 11 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Jan. 31, 2019
Jan. 31, 2018
Fair Value Disclosures [Abstract]        
Contingent consideration paid   $ 0.7 $ 0.3 $ 0.0
Contingent Consideration        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Contingent consideration reversed to the consolidated statement of operations and other comprehensive loss $ 0.1