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Reserves - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Liability for Claims and Claims Adjustment Expense [Line Items]
Unfavorable (favorable) prior year development	$ (32.2)	$ (61.3)
Other Product and Services
Liability for Claims and Claims Adjustment Expense [Line Items]
Unfavorable (favorable) prior year development	2.1	(2.0)
Global Lifestyle
Liability for Claims and Claims Adjustment Expense [Line Items]
Unfavorable (favorable) prior year development	(23.3)	(31.7)
Global Lifestyle | Connected Living
Liability for Claims and Claims Adjustment Expense [Line Items]
Unfavorable (favorable) prior year development	(7.7)
Global Lifestyle | Mobile Contracts
Liability for Claims and Claims Adjustment Expense [Line Items]
Unfavorable (favorable) prior year development	(7.3)
Global Lifestyle | Extended Service Contracts
Liability for Claims and Claims Adjustment Expense [Line Items]
Unfavorable (favorable) prior year development	(1.6)
Global Lifestyle | Credit and Other Insurance
Liability for Claims and Claims Adjustment Expense [Line Items]
Unfavorable (favorable) prior year development	1.2
Global Lifestyle | Global Automotive
Liability for Claims and Claims Adjustment Expense [Line Items]
Unfavorable (favorable) prior year development	(15.6)
Global Housing
Liability for Claims and Claims Adjustment Expense [Line Items]
Unfavorable (favorable) prior year development	(11.0)	(27.6)
Global Housing | Non-catastrophe Losses
Liability for Claims and Claims Adjustment Expense [Line Items]
Unfavorable (favorable) prior year development	(18.8)	$ 7.8
Global Housing | Lender-placed Insurance | Non-catastrophe Losses
Liability for Claims and Claims Adjustment Expense [Line Items]
Unfavorable (favorable) prior year development	$ (13.1)

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- Definition

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+ References

No definition available.

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- Definition

Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480046/944-40-55-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480081/944-40-50-3

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