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Long-term Equity-based Compensation Plans Omnibus Plan (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Shares Available for Grant under Omnibus Plan 7,834,964us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant  
Equity-based Compensation Expense $ 2.2us-gaap_AllocatedShareBasedCompensationExpense $ 2.6us-gaap_AllocatedShareBasedCompensationExpense
Unamortized Compensation Expense Related to Nonvested Awards $ 8.2us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized  
Unamortized Compensation Expense Related to Nonvested Awards, Period for Recognition 2 years 1 month 6 days  
Performance Based Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Reduction in Share Authorization if Maximum Performance Level is Met or Exceeded 540,900kmpr_ReductionInShareAuthorizationIfMaximumPerformanceLevelIsMetOrExceeded
/ us-gaap_AwardTypeAxis
= kmpr_PerformanceBasedRestrictedStockMember