Commitments and Contingencies - Narrative (Details)	Apr. 26, 2018 firm
Commitments and Contingencies Disclosure [Abstract]
Number of technology forensic firms engaged	3

Loss Contingency, Number Of Technology Forensic Firms Engaged

No definition available.

Name:	flt_LossContingencyNumberOfTechnologyForensicFirmsEngaged
Namespace Prefix:	flt_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration