Summary of significant accounting policies - Recent Accounting Pronouncements (Details) $ in Trillions	1 Months Ended
Mar. 31, 2020 USD ($)
Recent Accounting Pronouncements
Coronavirus Aid, Relief, and Economic Security (CARES) Act	$ 2.2

Represents the Coronavirus Aid, Relief, and Economic Security (CARES) Act funding in the US.

No definition available.

Name:	incy_CoronavirusAidReliefAndEconomicSecurityActFund
Namespace Prefix:	incy_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration