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Commitments and contingencies - Additional information (Details) |  |  |  |  |  |  | 1 Months Ended | 2 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 16, 2020 USD ($) | Oct. 25, 2019 lawsuit | Mar. 27, 2019 lawsuit | Jan. 15, 2018 plaintiff | Jan. 14, 2018 plaintiff | Aug. 01, 2016 employee | Mar. 31, 2017 lawsuit | Aug. 31, 2016 lawsuit | Jun. 30, 2020 USD ($) | May 02, 2020 USD ($) settlement employee | Feb. 01, 2020 USD ($) | Feb. 01, 2020 USD ($)
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 |  |  |  |  |  |  |  |  |  | $ (8,500,000) |  |
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 |
Subsequent Event | Shareholder Actions |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) related to litigation settlement |  |  |  |  |  |  |  |  | $ (35,000,000) |  |  |

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