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Long-term Equity-based Compensation - Activity Related to Nonvested Restricted Stock (Details) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended | 0 Months Ended | 36 Months Ended | 0 Months Ended | 36 Months Ended | 0 Months Ended | 36 Months Ended | 0 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Feb. 01, 2014 | Dec. 31, 2013 | Feb. 02, 2013 | Dec. 31, 2012 | Feb. 03, 2012 | Dec. 31, 2011 | Jan. 31, 2015
Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vested in Period, Total Fair Value | $ 3.6 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | $ 4.1 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | $ 4.0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  |  |  |  |  |
Income tax benefit from share-based compensation | $ 1.2 kmpr_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTaxBenefits / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | $ 1.4 kmpr_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTaxBenefits / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | $ 1.4 kmpr_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTaxBenefits / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  |  |  |  |  |  |
Time Vested Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Nonvested Balance at Beginning of Year, Restricted Shares | 101,627 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = kmpr_TimeVestedRestrictedStockMember |  |  |  |  |  |  |  |  |
Nonvested at Beginning of Year, Weighted Average Grant Date Fair Value (per share) | $ 31.48 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = kmpr_TimeVestedRestrictedStockMember |  |  |  |  |  |  |  |  |
Grants in Period | 2,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = kmpr_TimeVestedRestrictedStockMember |  |  |  |  |  |  |  |  |
Grants in Period, Weighted Average Grant Date Fair Value (per share) | $ 38.59 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = kmpr_TimeVestedRestrictedStockMember |  |  |  |  |  |  |  |  |
Vested in Period | (25,568)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = kmpr_TimeVestedRestrictedStockMember |  |  |  |  |  |  |  |  |
Vested in Period, Weighted Average Grant Date Fair Value (per share) | $ 30.56 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = kmpr_TimeVestedRestrictedStockMember |  |  |  |  |  |  |  |  |
Forfeited in Period | (24,964)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = kmpr_TimeVestedRestrictedStockMember |  |  |  |  |  |  |  |  |
Forfeited in Period, Weighted Average Grant Date Fair Value (per share) | $ 30.96 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = kmpr_TimeVestedRestrictedStockMember |  |  |  |  |  |  |  |  |
Nonvested Balance at End of Year, Restricted Shares | 53,095 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = kmpr_TimeVestedRestrictedStockMember |  |  |  |  |  |  |  |  |
Nonvested at End of Year, Weighted Average Grant Date Fair Value (per share) | $ 32.42 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = kmpr_TimeVestedRestrictedStockMember |  |  |  |  |  |  |  |  |
Performance Based Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Performance period | 3 years |  |  |  |  |  |  |  |  |
Nonvested Balance at Beginning of Year, Restricted Shares | 176,800 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = kmpr_PerformanceBasedRestrictedStockMember |  |  |  |  |  |  |  |  |
Nonvested at Beginning of Year, Weighted Average Grant Date Fair Value (per share) | $ 39.54 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = kmpr_PerformanceBasedRestrictedStockMember |  |  |  |  |  |  |  |  |
Grants in Period | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = kmpr_PerformanceBasedRestrictedStockMember |  |  |  |  |  |  |  |  |
Grants in Period, Weighted Average Grant Date Fair Value (per share) | $ 0.00 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = kmpr_PerformanceBasedRestrictedStockMember |  |  |  |  |  |  |  |  |
Vested in Period | (54,934)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = kmpr_PerformanceBasedRestrictedStockMember |  |  |  |  |  |  |  |  |
Vested in Period, Weighted Average Grant Date Fair Value (per share) | $ 39.83 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = kmpr_PerformanceBasedRestrictedStockMember |  |  |  |  |  |  |  |  |
Forfeited in Period | (11,241)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = kmpr_PerformanceBasedRestrictedStockMember |  |  |  |  |  |  |  |  |
Forfeited in Period, Weighted Average Grant Date Fair Value (per share) | $ 40.75 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = kmpr_PerformanceBasedRestrictedStockMember |  |  |  |  |  |  |  |  |
Nonvested Balance at End of Year, Restricted Shares | 110,625 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = kmpr_PerformanceBasedRestrictedStockMember |  |  |  |  |  |  |  |  |
Nonvested at End of Year, Weighted Average Grant Date Fair Value (per share) | $ 39.28 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = kmpr_PerformanceBasedRestrictedStockMember |  |  |  |  |  |  |  |  |
Reduction in share authorization if maximum performance level is met or exceeded (shares) | 517,500 kmpr_ReductionInShareAuthorizationIfMaximumPerformanceLevelIsMetOrExceeded / us-gaap_AwardTypeAxis = kmpr_PerformanceBasedRestrictedStockMember |  |  |  |  |  |  |  |  |
Time Vested Restricted Stock Units [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Nonvested Balance at Beginning of Year, Restricted Shares | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = kmpr_TimeVestedRestrictedStockUnitsMember |  |  |  |  |  |  |  |  |
Nonvested at Beginning of Year, Weighted Average Grant Date Fair Value (per share) | $ 0.00 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = kmpr_TimeVestedRestrictedStockUnitsMember |  |  |  |  |  |  |  |  |
Grants in Period | 41,925 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = kmpr_TimeVestedRestrictedStockUnitsMember |  |  |  |  |  |  |  |  |
Grants in Period, Weighted Average Grant Date Fair Value (per share) | $ 36.56 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = kmpr_TimeVestedRestrictedStockUnitsMember |  |  |  |  |  |  |  |  |
Vested in Period | (9,351)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = kmpr_TimeVestedRestrictedStockUnitsMember |  |  |  |  |  |  |  |  |
Vested in Period, Weighted Average Grant Date Fair Value (per share) | $ 36.47 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = kmpr_TimeVestedRestrictedStockUnitsMember |  |  |  |  |  |  |  |  |
Forfeited in Period | (2,550)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = kmpr_TimeVestedRestrictedStockUnitsMember |  |  |  |  |  |  |  |  |
Forfeited in Period, Weighted Average Grant Date Fair Value (per share) | $ 36.47 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = kmpr_TimeVestedRestrictedStockUnitsMember |  |  |  |  |  |  |  |  |
Nonvested Balance at End of Year, Restricted Shares | 30,024 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = kmpr_TimeVestedRestrictedStockUnitsMember |  |  |  |  |  |  |  |  |
Nonvested at End of Year, Weighted Average Grant Date Fair Value (per share) | $ 36.60 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = kmpr_TimeVestedRestrictedStockUnitsMember |  |  |  |  |  |  |  |  |
Performance Based Restricted Stock Units [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Nonvested Balance at Beginning of Year, Restricted Shares | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = kmpr_PerformanceBasedRestrictedStockUnitsMember |  |  |  |  |  |  |  |  |
Nonvested at Beginning of Year, Weighted Average Grant Date Fair Value (per share) | $ 0.00 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = kmpr_PerformanceBasedRestrictedStockUnitsMember |  |  |  |  |  |  |  |  |
Grants in Period | 66,575 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod / us-gaap_AwardTypeAxis = kmpr_PerformanceBasedRestrictedStockUnitsMember |  |  |  |  |  |  |  |  |
Grants in Period, Weighted Average Grant Date Fair Value (per share) | $ 40.50 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = kmpr_PerformanceBasedRestrictedStockUnitsMember |  |  |  |  |  |  |  |  |
Vested in Period | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod / us-gaap_AwardTypeAxis = kmpr_PerformanceBasedRestrictedStockUnitsMember |  |  |  |  |  |  |  |  |
Vested in Period, Weighted Average Grant Date Fair Value (per share) | $ 0.00 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = kmpr_PerformanceBasedRestrictedStockUnitsMember |  |  |  |  |  |  |  |  |
Forfeited in Period | (4,700)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod / us-gaap_AwardTypeAxis = kmpr_PerformanceBasedRestrictedStockUnitsMember |  |  |  |  |  |  |  |  |
Forfeited in Period, Weighted Average Grant Date Fair Value (per share) | $ 40.50 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = kmpr_PerformanceBasedRestrictedStockUnitsMember |  |  |  |  |  |  |  |  |
Nonvested Balance at End of Year, Restricted Shares | 61,875 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = kmpr_PerformanceBasedRestrictedStockUnitsMember |  |  |  |  |  |  |  |  |
Nonvested at End of Year, Weighted Average Grant Date Fair Value (per share) | $ 40.50 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = kmpr_PerformanceBasedRestrictedStockUnitsMember |  |  |  |  |  |  |  |  |
Performance Period, 2014 to 2016 [Member] | Performance Based Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of additional shares to be granted if maximum performance level is met or exceeded | 61,875 kmpr_NumberOfAdditionalSharesToBeGrantedIfMaximumPerfornanceLevelIsMetOrExceeded / us-gaap_AwardTypeAxis = kmpr_PerformanceBasedRestrictedStockMember / kmpr_PerformancePeriodAxis = kmpr_PerformancePeriod2014to2016Member |  |  |  |  |  |  |  |  |
Reduction in share authorization if maximum performance level is met or exceeded (shares) | 185,625 kmpr_ReductionInShareAuthorizationIfMaximumPerformanceLevelIsMetOrExceeded / us-gaap_AwardTypeAxis = kmpr_PerformanceBasedRestrictedStockMember / kmpr_PerformancePeriodAxis = kmpr_PerformancePeriod2014to2016Member |  |  |  |  |  |  |  |  |
Performance Period, 2013 to 2015 [Member] | Performance Based Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of additional shares to be granted if maximum performance level is met or exceeded |  | 52,850 kmpr_NumberOfAdditionalSharesToBeGrantedIfMaximumPerfornanceLevelIsMetOrExceeded / us-gaap_AwardTypeAxis = kmpr_PerformanceBasedRestrictedStockMember / kmpr_PerformancePeriodAxis = kmpr_PerformancePeriod2013To2015Member |  |  | 52,850 kmpr_NumberOfAdditionalSharesToBeGrantedIfMaximumPerfornanceLevelIsMetOrExceeded / us-gaap_AwardTypeAxis = kmpr_PerformanceBasedRestrictedStockMember / kmpr_PerformancePeriodAxis = kmpr_PerformancePeriod2013To2015Member |  |  |  |  |
Reduction in share authorization if maximum performance level is met or exceeded (shares) |  | 158,550 kmpr_ReductionInShareAuthorizationIfMaximumPerformanceLevelIsMetOrExceeded / us-gaap_AwardTypeAxis = kmpr_PerformanceBasedRestrictedStockMember / kmpr_PerformancePeriodAxis = kmpr_PerformancePeriod2013To2015Member |  |  | 158,550 kmpr_ReductionInShareAuthorizationIfMaximumPerformanceLevelIsMetOrExceeded / us-gaap_AwardTypeAxis = kmpr_PerformanceBasedRestrictedStockMember / kmpr_PerformancePeriodAxis = kmpr_PerformancePeriod2013To2015Member |  |  |  |  |
Performance Period, 2011 to 2013 [Member] | Performance Based Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Payout percentage for exceeding performance target |  |  |  |  | 118.00%kmpr_PayoutPercentageForExceedingPerformanceTarget / us-gaap_AwardTypeAxis = kmpr_PerformanceBasedRestrictedStockMember / kmpr_PerformancePeriodAxis = kmpr_PerformancePeriod2011To2013Member |  |  |  |  |
Shares issued during the period |  |  |  | 9,014 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_AwardTypeAxis = kmpr_PerformanceBasedRestrictedStockMember / kmpr_PerformancePeriodAxis = kmpr_PerformancePeriod2011To2013Member |  |  |  |  |  |
Performance Period, 2010 to 2012 [Member] | Performance Based Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Payout percentage for exceeding performance target |  |  |  |  |  |  | 114.00%kmpr_PayoutPercentageForExceedingPerformanceTarget / us-gaap_AwardTypeAxis = kmpr_PerformanceBasedRestrictedStockMember / kmpr_PerformancePeriodAxis = kmpr_PerformancePeriod2010To2012Member |  |  |
Shares issued during the period |  |  |  |  |  | 6,996 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_AwardTypeAxis = kmpr_PerformanceBasedRestrictedStockMember / kmpr_PerformancePeriodAxis = kmpr_PerformancePeriod2010To2012Member |  |  |  |
Performance Period, 2009 to 2011 [Member] | Performance Based Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Payout percentage for exceeding performance target |  |  |  |  |  |  |  |  | 183.00%kmpr_PayoutPercentageForExceedingPerformanceTarget / us-gaap_AwardTypeAxis = kmpr_PerformanceBasedRestrictedStockMember / kmpr_PerformancePeriodAxis = kmpr_PerformancePeriod2009To2011Member |
Shares issued during the period |  |  |  |  |  |  |  | 40,727 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_AwardTypeAxis = kmpr_PerformanceBasedRestrictedStockMember / kmpr_PerformancePeriodAxis = kmpr_PerformancePeriod2009To2011Member |  |
Subsequent Event [Member] | Performance Period, 2012 to 2014 [Member] | Performance Based Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Stock issued during period, shares, share-based compensation, forfeited |  |  |  |  |  |  |  |  |  | 57,775 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensationForfeited / us-gaap_AwardTypeAxis = kmpr_PerformanceBasedRestrictedStockMember / kmpr_PerformancePeriodAxis = kmpr_PerformancePeriod2012To2014Member / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

X
- Definition Number of Additional Shares To Be Granted If Maximum Perfornance Level Is Met or Exceeded + References No definition available. + Details
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Namespace Prefix: | kmpr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Payout Percentage for Exceeding Performance Target + References No definition available. + Details
Name: | kmpr_PayoutPercentageForExceedingPerformanceTarget
Namespace Prefix: | kmpr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Performance Period + References No definition available. + Details
Name: | kmpr_PerformancePeriod
Namespace Prefix: | kmpr_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Reduction in Share Authorization if Maximum Performance Level is Met or Exceeded + References No definition available. + Details
Name: | kmpr_ReductionInShareAuthorizationIfMaximumPerformanceLevelIsMetOrExceeded
Namespace Prefix: | kmpr_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Tax Benefits + References No definition available. + Details
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Namespace Prefix: | kmpr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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Balance Type: | na
Period Type: | duration

X
- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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Data Type: | xbrli:sharesItemType
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Period Type: | duration

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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Balance Type: | na
Period Type: | duration

X
- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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Data Type: | xbrli:sharesItemType
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Period Type: | instant

X
- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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