v2.3.0.15

Basis of Presentation (Details) (USD $) In Millions	Sep. 30, 2011
Anticipated Change in Stockholders Equity After Adoption of New Accounting Pronouncement	$ (100)

X

- Definition

Anticipated Change in Stockholders Equity After Adoption of New Accounting Pronouncement

+ Details

Name:	kmpr_AnticipatedChangeInStockholdersEquityAfterAdoptionOfNewAccountingPronouncement
Namespace Prefix:	kmpr
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant