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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 |  |  |

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- Definition Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 + Details
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