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Long-term Equity-based Compensation -Schedule of Share-based Compensation, Nonemployee Director Deferred Stock Unit Award Plan (Details) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Schedule of Share-based Compensation, Nonemployee Director Deferred Stock Unit Award Plan [Abstract] |  |
Total fair value of DSUs that vested during the years | $ 0.2 kmpr_SharebasedCompensationArrangementbySharebasedPaymentAwardDeferredStockUnitVestedinPeriodFairValue | $ 0.1 kmpr_SharebasedCompensationArrangementbySharebasedPaymentAwardDeferredStockUnitVestedinPeriodFairValue
Deferred Stock Units, Outstanding, Number, Period Start | 4,000 kmpr_SharebasedCompensationArrangementbySharebasedPaymentAwardDeferredStockUnitsOutstandingNumber |
Deferred Stock Units, Outstanding, Weighted Average Exercise Price, Period Start (per share) | $ 31.50 kmpr_SharebasedCompensationArrangementbySharebasedPaymentAwardDeferredStockUnitsOutstandingWeightedAverageExercisePrice |
Deferred Stock Units, Granted and Vested in Period | 4,000 kmpr_SharebasedCompensationArrangementbySharebasedPaymentAwardDeferredStockUnitsGrantedandVestedinPeriod |
Deferred Stock Units, Granted and Vested in Period, Weighted Average Exercise Price (per share) | $ 37.53 kmpr_SharebasedCompensationArrangementsbySharebasedPaymentAwardDeferredStockUnitsGrantedandVestedinPeriodWeightedAverageExercisePrice |
Deferred Stock Units, Outstanding, Number, Period End | 8,000 kmpr_SharebasedCompensationArrangementbySharebasedPaymentAwardDeferredStockUnitsOutstandingNumber | 4,000 kmpr_SharebasedCompensationArrangementbySharebasedPaymentAwardDeferredStockUnitsOutstandingNumber
Deferred Stock Units, Outstanding, Weighted Average Exercise Price, Period End (per share) | $ 34.52 kmpr_SharebasedCompensationArrangementbySharebasedPaymentAwardDeferredStockUnitsOutstandingWeightedAverageExercisePrice | $ 31.50 kmpr_SharebasedCompensationArrangementbySharebasedPaymentAwardDeferredStockUnitsOutstandingWeightedAverageExercisePrice

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- Details
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- Definition Number of share units granted and vested during the period. + References No definition available. + Details
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- Definition Number of share units vested and outstanding. + References No definition available. + Details
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- Definition Weighted average price at which guarantees can acquire the stock units issued under the deferred stock unit plan. + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Deferred Stock Unit, Vested in Period, Fair Value + References No definition available. + Details
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- Definition Weighted average per unit amount at which guarantees can acquire stock units under the deferred stock unit plan. + References No definition available. + Details
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