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Income from Continuing Operations Per Unrestricted Share (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Schedule of Basic and Diluted Earnings Per Share [Line Items]    
Income from Continuing Operations $ 13.5us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest $ 35.2us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Dilutive Effect on Income of Equity-based Compensation Equivalent Shares 0us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits 0us-gaap_AmountOfDilutiveSecuritiesStockOptionsAndRestrictiveStockUnits
Diluted Income from Continuning Operations Attributed to Unrestricted Shares 13.6kmpr_IncomeLossFromContinuingOperationsDiluted 35.0kmpr_IncomeLossFromContinuingOperationsDiluted
Weighted-Average Unrestricted Shares Outstanding 51,872,800us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 55,312,900us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Equity-based Compensation Equivalent Shares 96,500us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 130,200us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Weighted-Average Unrestricted Shares and Equivalent Shares Outstanding Assuming Dilution 51,969,300us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 55,443,100us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic Income from Continuing Operations Per Unrestricted Share (in dollars per share) $ 0.26us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.63us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Diluted Income from Continuing Operations Per Untrestriced Share (in dollars per share) $ 0.26us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.63us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Unrestricted Shares [Member]    
Schedule of Basic and Diluted Earnings Per Share [Line Items]    
Income from Continuing Operations 13.6us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
35.0us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonStockMember
Participating Awards [Member]    
Schedule of Basic and Diluted Earnings Per Share [Line Items]    
Income from Continuing Operations $ (0.1)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_AwardTypeAxis
= kmpr_ParticipatingAwardsMember
$ 0.2us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_AwardTypeAxis
= kmpr_ParticipatingAwardsMember