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Commitments and contingencies - Additional information (Details)
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 16, 2020
USD ($)
Oct. 25, 2019
lawsuit
Mar. 27, 2019
lawsuit
Jan. 15, 2018
plaintiff
Jan. 14, 2018
plaintiff
Aug. 01, 2016
employee
Feb. 28, 2019
USD ($)
Mar. 31, 2017
lawsuit
Aug. 31, 2016
lawsuit
Aug. 01, 2020
USD ($)
Feb. 01, 2020
USD ($)
Aug. 01, 2020
USD ($)
settlement
employee
Loss Contingencies [Line Items]                        
Number of anticipated settlements | settlement                       4
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 | lawsuit   2 2         2 2      
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  
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, net | Shareholder Actions                        
Loss Contingencies [Line Items]                        
Gain (loss) related to litigation settlement                     (33,200,000)  
Legal fees                     $ 600,000