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Business Segments - Segment Assets (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Segment Reporting Information [Line Items]    
Assets $ 7,833.4us-gaap_Assets $ 7,656.4us-gaap_Assets
Property and Casualty Insurance [Member]    
Segment Reporting Information [Line Items]    
Assets 2,486.1us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= kmpr_PropertyAndCasualtyInsuranceMember		 2,648.6us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= kmpr_PropertyAndCasualtyInsuranceMember
Life and Health Insurance [Member]    
Segment Reporting Information [Line Items]    
Assets 4,810.6us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= kmpr_LifeAndHealthInsuranceMember		 4,545.6us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= kmpr_LifeAndHealthInsuranceMember
Corporate and Other, Net [Member]    
Segment Reporting Information [Line Items]    
Assets $ 536.7us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember		 $ 462.2us-gaap_Assets
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_MaterialReconcilingItemsMember