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Commitments and contingencies - Additional information (Details)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 16, 2020
USD ($)
Jan. 15, 2018
plaintiff
Jan. 14, 2018
plaintiff
Aug. 01, 2016
employee
Feb. 28, 2019
USD ($)
Aug. 31, 2016
lawsuit
Aug. 01, 2020
USD ($)
Feb. 01, 2020
USD ($)
Oct. 31, 2020
USD ($)
employee
settlement
Dec. 31, 2019
settlement
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 3
Litigation settlement, amount awarded to other party $ 240,000,000                    
Gain (loss) related to litigation settlement             $ (35,000,000)   $ (7,500,000)    
Insurance recoveries               $ 207,400,000      
Number of anticipated settlements | settlement                 4    
Consumer Financial Protection Bureau                      
Loss Contingencies [Line Items]                      
Loss contingency, damages paid, value         $ 10,000,000            
New York Attorney General                      
Loss Contingencies [Line Items]                      
Loss contingency, damages paid, value         $ 1,000,000            
Other operating income (loss) | Shareholder Actions                      
Loss Contingencies [Line Items]                      
Gain (loss) related to litigation settlement               (33,200,000)      
Legal fees               $ 600,000