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