Derivative Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2026

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Derivative Instruments

The following table identifies the fair value and notional amounts of derivative instruments included in the Consolidated Balance Sheets, categorized by primary underlying risk:

	March 31, 2026						December 31, 2025
	Derivative assets at fair value		Derivative liabilities at fair value		Notional amounts(1)		Derivative assets at fair value		Derivative liabilities at fair value		Notional amounts(1)
Credit default swaps	$	—	$	—	$	—	$	2.4	$	—	$	2.2
Forwards(2)	—		(2.0)		158.1		—		(1.7)		133.3
Total	$	—	$	(2.0)			$	2.4	$	(1.7)

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(1)The absolute notional exposure represents the Company’s derivative activity, which is representative of the volume of derivatives held during the year.

(2)Contracts used to primarily manage foreign currency risks in underwriting.

Schedule of Derivative Instruments, Gain (Loss)

The following table presents the Company’s net realized gains/(losses) and change in net unrealized gains/(losses) relating to derivative trading activities for the three months ended March 31, 2026 and 2025. Net realized gains/(losses) and net unrealized gains/(losses) related to derivatives are included in net realized and unrealized investment gains/(losses) and net foreign exchange losses in the Consolidated Statements of Income.

	Three Months Ended
	March 31, 2026				March 31, 2025
	Net realized gains/(losses)		Change in net unrealized gains/(losses)		Net realized gains/(losses)		Change in net unrealized gains/(losses)
Fixed income portfolio management
Credit default swaps	$	0.1	$	—	$	—	$	—
Foreign exchange contracts
Forwards (1)	3.7		(0.3)		(3.2)		(1.3)
Total	$	3.8	$	(0.3)	$	(3.2)	$	(1.3)

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(1)Contracts used to primarily manage foreign currency risks in underwriting.