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Commitments and contingencies - Additional information (Details)						1 Months Ended			9 Months Ended
	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	Nov. 02, 2019 employee
EPA Collective Action
Loss Contingencies [Line Items]
Number of employees opted in lawsuit (employee) (plaintiff)			254	70,000	10,314				9,124
S.D.N.Y. Cases
Loss Contingencies [Line Items]
New claims filed, number | lawsuit	2	2					2	2
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

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Amount of damages paid to the plaintiff in the legal matter.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 9
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-URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14557-108349

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The total number of new claims filed pertaining to a loss contingency during the period.

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Number of plaintiffs that have filed claims pertaining to a loss contingency.

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