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Investments - Narrative (Details)	Dec. 31, 2023 USD ($) security	Jun. 25, 2023 USD ($) security
Net Investment Income [Line Items]
Number of instruments in loss position | security	43	95
Fair value of instruments in loss position	$ 242,300,000	$ 520,900,000
Unrealized loss	300,000	1,600,000
Accrued interest receivable	14,200,000	10,100,000
Allowance for credit losses	$ 0	$ 0
Cash and Cash Equivalents
Net Investment Income [Line Items]
Number of instruments in loss position | security		2
Fair value of instruments in loss position		$ 18,500,000
Unrealized loss		$ 100,000

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Amount excluding accrued interest, of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Carrying amount as of the balance sheet date of current interest earned but not received. Also called accrued interest or accrued interest receivable. For classified balance sheets, represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer.

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