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Consolidated Statements of Operations (unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Income Statement [Abstract]
Net realized losses on investments	$ 5.6	$ 3.0

X

- Definition

Investment Impairment Losses included in Net Realized Gains (Losses)

+ References

No definition available.

+ Details

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Namespace Prefix:	aiz_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_IncomeStatementAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration