Credit Losses (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
Credit Loss [Abstract]
Available-for-sale Investments, Allowance for Credit Loss, Beginning Balance	$ 1.0	$ 2.9
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Not Previously Recorded	0.1	0.3
Available-for-sale investment, allowance for credit loss, increase (decrease)	(0.4)	(0.9)
Debt Securities, Available-for-Sale, Allowance for Credit Loss, Securities Sold	(0.4)	(1.3)
Available-for-sale Investments, Allowance for Credit Loss, Ending Balance	0.3	1.0
Reinsurance Recoverable, Allowance for Credit Loss, Beginning Balance	27.5	3.7
Reinsurance Recoverable, Allowance for Credit Loss, Period Increase (Decrease)	(11.3)	23.8
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance	16.2	27.5
Accounts Receivable, Allowance for Credit Loss, Beginning Balance	24.6	21.0
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease)	(1.7)	3.6
Accounts Receivable, Allowance for Credit Loss, Ending Balance	$ 22.9	$ 24.6

Amount of allowance for credit loss on accounts receivable.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of increase (decrease) in allowance for credit loss on accounts receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
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-Name Accounting Standards Codification
-Section 50
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-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

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- References

No definition available.

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- Definition

Amount 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), classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Amount of expense 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), for which no credit loss was previously recorded.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Amount of increase (decrease) in allowance for credit loss of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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- Definition

Amount of decrease in 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) from sale.

+ References

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- Definition

Amount of increase (decrease) in allowance for credit loss on reinsurance recoverable.

+ References

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- Definition

Amount of allowance for credit loss on reinsurance recoverable.

+ References

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