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BUSINESS SEGMENTS - NARRATIVE (Details)	9 Months Ended
	Sep. 30, 2023 product_line
Segment Reporting [Abstract]
Number of product lines	3

X

- 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

X

- References

No definition available.

+ Details

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