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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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Number of Anticipated Settlements

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Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process.

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The amount recovered from insurance. These recoveries reduce costs and losses that are reported as a separate line item under operating expenses.

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