Earnings (loss) per share available to Third Point Re common shareholders (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Weighted-average number of common shares outstanding:
Basic number of common shares outstanding	92,613,393	91,903,556	92,466,813	91,784,268
Dilutive effect of options	0	0	0	208,652
Dilutive effect of warrants	0	0	0	150,501
Dilutive effect of restricted shares with service and performance condition	356,253	0	410,861	566,000
Diluted number of common shares outstanding	92,969,646	91,903,556	92,877,674	92,709,421
Basic earnings (loss) per common share:
Net income (loss) available to Third Point Re common shareholders	$ 68,743	$ (15,099)	$ 9,121	$ 170,881
Net income allocated to Third Point Re participating common shareholders	(574)	0	(56)	(515)
Net income (loss) allocated to Third Point Re common shareholders	$ 68,169	$ (15,099)	$ 9,065	$ 170,366
Basic earnings (loss) per share available to Third Point Re common shareholders	$ 0.74	$ (0.16)	$ 0.10	$ 1.86
Earnings per share, diluted [Abstract]
Net income (loss) available to Third Point Re common shareholders	$ 68,743	$ (15,099)	$ 9,121	$ 170,881
Net income allocated to Third Point Re participating common shareholders	(572)	0	(56)	(510)
Net income (loss) allocated to Third Point Re common shareholders	$ 68,171	$ (15,099)	$ 9,065	$ 170,371
Diluted earnings (loss) per share available to Third Point Re common shareholders	$ 0.73	$ (0.16)	$ 0.10	$ 1.84
Antidilutive securities excluded from computation of earnings per share	3,741,266		3,741,266	3,712,037
Options and warrants
Earnings per share, diluted [Abstract]
Antidilutive securities excluded from computation of earnings per share	3,494,979	9,745,817	3,494,979