Commitments and Contingencies - Contingencies (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Indemnification claims	$ 0
Contingent liabilities	$ 0	$ 0.0

Amount of indemnification claims currently outstanding

No definition available.

Name:	vrtx_IndemnificationClaims
Namespace Prefix:	vrtx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant