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Commitments and contingencies - Additional information (Details)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 16, 2020
USD ($)
Jan. 15, 2018
plaintiff
Jan. 14, 2018
plaintiff
Aug. 01, 2016
employee
Aug. 31, 2016
lawsuit
Aug. 01, 2020
USD ($)
Oct. 30, 2021
employee
Jan. 30, 2021
USD ($)
settlement
Feb. 01, 2020
USD ($)
Dec. 31, 2019
action
Dec. 31, 2019
complaint
Dec. 31, 2017
lawsuit
EPA Collective Action                        
Loss Contingencies [Line Items]                        
Number of employees opted in lawsuit (employee) (plaintiff)   254 70,000 10,314     9,124          
Shareholder Actions                        
Loss Contingencies [Line Items]                        
New claims filed, number         2         4 4 3
Litigation settlement, amount awarded to other party $ 240.0         $ 240.0            
Gain (loss) related to litigation settlement           $ (35.0)   $ (7.5)        
Insurance recoveries                 $ 207.4      
Number of anticipated settlements | settlement               4        
Other operating income, net | Shareholder Actions                        
Loss Contingencies [Line Items]                        
Gain (loss) related to litigation settlement                 (33.2)      
Legal fees                 $ 0.6