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Catastrophe Reinsurance - Catastrophe Reinsurance Premiums (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Liability for Catastrophe Claims [Line Items]      
Ceded Catastrphoe Reinsurance Premiums $ 26.0us-gaap_CededPremiumsEarned $ 33.9us-gaap_CededPremiumsEarned $ 42.5us-gaap_CededPremiumsEarned
Catastrophe Reinsurance [Member]      
Liability for Catastrophe Claims [Line Items]      
Ceded Catastrphoe Reinsurance Premiums 17.7us-gaap_CededPremiumsEarned
/ us-gaap_ReinsurancePolicyTypeAxis
= kmpr_CatastropheReinsuranceMember		 23.6us-gaap_CededPremiumsEarned
/ us-gaap_ReinsurancePolicyTypeAxis
= kmpr_CatastropheReinsuranceMember		 27.1us-gaap_CededPremiumsEarned
/ us-gaap_ReinsurancePolicyTypeAxis
= kmpr_CatastropheReinsuranceMember
Property and Casualty Insurance [Member] | Catastrophe Reinsurance [Member]      
Liability for Catastrophe Claims [Line Items]      
Ceded Catastrphoe Reinsurance Premiums 17.6us-gaap_CededPremiumsEarned
/ us-gaap_ReinsurancePolicyTypeAxis
= kmpr_CatastropheReinsuranceMember
/ us-gaap_StatementBusinessSegmentsAxis
= kmpr_PropertyAndCasualtyInsuranceMember		 23.6us-gaap_CededPremiumsEarned
/ us-gaap_ReinsurancePolicyTypeAxis
= kmpr_CatastropheReinsuranceMember
/ us-gaap_StatementBusinessSegmentsAxis
= kmpr_PropertyAndCasualtyInsuranceMember		 25.1us-gaap_CededPremiumsEarned
/ us-gaap_ReinsurancePolicyTypeAxis
= kmpr_CatastropheReinsuranceMember
/ us-gaap_StatementBusinessSegmentsAxis
= kmpr_PropertyAndCasualtyInsuranceMember
Life and Health Insurance [Member] | Catastrophe Reinsurance [Member]      
Liability for Catastrophe Claims [Line Items]      
Ceded Catastrphoe Reinsurance Premiums $ 0.1us-gaap_CededPremiumsEarned
/ us-gaap_ReinsurancePolicyTypeAxis
= kmpr_CatastropheReinsuranceMember
/ us-gaap_StatementBusinessSegmentsAxis
= kmpr_LifeAndHealthInsuranceMember		 $ 0us-gaap_CededPremiumsEarned
/ us-gaap_ReinsurancePolicyTypeAxis
= kmpr_CatastropheReinsuranceMember
/ us-gaap_StatementBusinessSegmentsAxis
= kmpr_LifeAndHealthInsuranceMember		 $ 2.0us-gaap_CededPremiumsEarned
/ us-gaap_ReinsurancePolicyTypeAxis
= kmpr_CatastropheReinsuranceMember
/ us-gaap_StatementBusinessSegmentsAxis
= kmpr_LifeAndHealthInsuranceMember