Cover - shares	9 Months Ended
	Sep. 30, 2020	Nov. 02, 2020
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2020
Document Transition Report	false
Entity File Number	001-35039
Entity Registrant Name	THIRD POINT REINSURANCE LTD.
Entity Incorporation, State or Country Code	D0
Entity Tax Identification Number	98-1039994
Entity Address, Street Address	Point House
Entity Address, Address Line Two	3 Waterloo Lane
Entity Address, City or Town	Pembroke
Entity Address, Postal Zip Code	HM 08
Entity Address, State or Province	BM
City Area Code	441
Local Phone Number	542-3300
Title of each class	Common Shares, $0.10 par value
Trading Symbol	TPRE
Name of each exchange on which registered	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		95,529,485
Entity Central Index Key	0001576018
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Amendment Flag	false