v2.4.0.6

Income Taxes (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2012
Income Tax Disclosure [Abstract] |
Schedule of Current and Deferred Income Tax Assets Table [Text Block] | Current and Deferred Income Tax Assets at September 30, 2012 and December 31, 2011 were:
(Dollars in Millions) |  | Sep 30, 2012 |  | Dec 31, 2011
Current Income Tax Assets |  | $ | 0.1 |  |  | $ | 2.5 |
Deferred Income Tax Assets |  | 6.7 |  |  | 10.7 |
Valuation Allowance for State Income Taxes |  | (6.7 | ) |  | (6.8 | )
Current and Deferred Income Tax Assets |  | $ | 0.1 |  |  | $ | 6.4 |
Schedule of Components of Income Tax Liabilities Table [Text Block] | The components of Liabilities for Income Taxes at September 30, 2012 and December 31, 2011 were:
(Dollars in Millions) |  | Sep 30, 2012 |  | Dec 31, 2011
Current Income Tax Liabilities |  | $ | 8.3 |  |  | $ | — |
Deferred Income Tax Liabilities |  | 44.5 |  |  | — |
Unrecognized Tax Benefits |  | 6.3 |  |  | 6.2 |
Liabilities for Income Taxes |  | $ | 59.1 |  |  | $ | 6.2 |

X
- Definition Schedule of Compoents of Income Tax Liabilities Table [Text Block] + References No definition available. + Details
Name: | kmpr_ScheduleOfCompoentsOfIncomeTaxLiabilitiesTableTextBlock
Namespace Prefix: | kmpr_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Schedule of Current and Deferred Income Tax Assets Table [Text Block] + References No definition available. + Details
Name: | kmpr_ScheduleOfCurrentAndDeferredIncomeTaxAssetsTableTextBlock
Namespace Prefix: | kmpr_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration