Segments (Tables)

3 Months Ended

Mar. 31, 2026

Segment Reporting [Abstract]

Schedule of Group Segment Disclosures

The following tables summarize the Company’s segment disclosures:

	Three Months Ended March 31, 2026
	Insurance			Reinsurance			Other		Total
Gross premiums written	$	1,436.1		$	404.3		$	—	$	1,840.4
Net premiums written	1,004.0			176.3			—		1,180.3
Net premiums earned	514.9			53.6			—		568.5
Losses and loss adjustment expenses	(227.8)			4.0			—		(223.8)
Policy acquisition expenses	(139.2)			(13.3)			(86.8)		(239.3)
General and administrative expenses	—			—			(29.2)		(29.2)
Underwriting income	147.9			44.3					76.2
Net investment income									43.7
Net realized and unrealized investment losses									(1.6)
Corporate and other expenses									(0.4)
Net foreign exchange losses									(0.1)
Financing costs									(14.7)
Income before income taxes									103.1
Income tax benefit									4.9
Net income									$	108.0
Losses and loss adjustment expenses incurred - current year	(212.6)			(14.3)					$	(226.9)
Losses and loss adjustment expenses incurred - prior accident years	(15.2)			18.3					3.1
Losses and loss adjustment expenses incurred - total	$	(227.8)		$	4.0				$	(223.8)
Underwriting Ratios(1)
Loss ratio - current year	41.2		%	26.6		%			39.9		%
Loss ratio - prior accident years	3.0		%	(34.1		%)			(0.5		%)
Loss ratio - total	44.2		%	(7.5		%)			39.4		%
Policy acquisition expense ratio	27.0		%	24.8		%			26.8		%
Underwriting ratio	71.2		%	17.3		%			66.2		%
The Fidelis Partnership commissions ratio									15.3		%
General and administrative expense ratio									5.1		%
Combined ratio									86.6		%

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(1)Underwriting ratios are calculated by dividing the related expense by net premiums earned.

	Three Months Ended March 31, 2025
	Insurance			Reinsurance			Other		Total
Gross premiums written	$	1,267.0		$	455.9		$	—	$	1,722.9
Net premiums written	808.9			217.5			—		1,026.4
Net premiums earned	511.9			91.1			—		603.0
Losses and loss adjustment expenses	(281.4)			(147.8)			—		(429.2)
Policy acquisition expenses	(148.2)			(19.7)			(78.4)		(246.3)
General and administrative expenses	—			—			(22.0)		(22.0)
Underwriting income/(loss)	82.3			(76.4)					(94.5)
Net investment income									49.5
Net realized and unrealized investment gains									5.9
Net foreign exchange losses									(2.5)
Financing costs									(8.7)
Loss before income taxes									(50.3)
Income tax benefit									7.8
Net loss									$	(42.5)
Losses and loss adjustment expenses incurred - current year	(288.9)			(181.1)					$	(470.0)
Losses and loss adjustment expenses incurred - prior accident years	7.5			33.3					40.8
Losses and loss adjustment expenses incurred - total	$	(281.4)		$	(147.8)				$	(429.2)
Underwriting Ratios(1)
Loss ratio - current year	56.5		%	198.8		%			78.0		%
Loss ratio - prior accident years	(1.5		%)	(36.6		%)			(6.8		%)
Loss ratio - total	55.0		%	162.2		%			71.2		%
Policy acquisition expense ratio	29.0		%	21.6		%			27.8		%
Underwriting ratio	84.0		%	183.8		%			99.0		%
The Fidelis Partnership commissions ratio									13.0		%
General and administrative expense ratio									3.6		%
Combined ratio									115.6		%

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(1)Underwriting ratios are calculated by dividing the related expense by net premiums earned.