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BUSINESS SEGMENTS - NARRATIVE (Details)	3 Months Ended
	Mar. 31, 2026 product_line
Segment Reporting [Abstract]
Number of product lines	3
Number Of Reportable Segments Disclosed By Definition Flag	false

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- Definition

Number Of Reportable Segments Disclosed By Definition Flag

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Balance Type:	na
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- Definition

Number of Product Lines

+ References

No definition available.

+ Details

Name:	cno_NumberofProductLines
Namespace Prefix:	cno_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

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