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Cover
Aug. 12, 2021
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Oct. 26, 2021
Entity File Number 001-38971
Entity Registrant Name XL FLEET CORP.
Entity Central Index Key 0001772720
Entity Tax Identification Number 83-4109918
Entity Incorporation, State or Country Code DE
Entity Address, Address Line One 145 Newton Street
Entity Address, City or Town Boston
Entity Address, State or Province MA
Entity Address, Postal Zip Code 02135
City Area Code (617)
Local Phone Number 718-0329
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock, par value $0.0001 per share
Trading Symbol XL
Security Exchange Name NYSE
Entity Emerging Growth Company true
Elected Not To Use the Extended Transition Period false