Contract Liabilities and Other Disclosures (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
Sep. 30, 2020	Dec. 31, 2019
Contract Liabilities and Other Disclosures (Details) [Line Item]
Revenue recognized deferred income	$ 8.3	$ 9.6

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

No definition available.

Name:	inse_RevenueRecognizedInDeferredIncome
Namespace Prefix:	inse_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration