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Income From Investments - Net Investment Income (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Investment Income: |  |  |  |  |  |  |  |  |  |  |
Equity Method Limited Liability Investments |  |  |  |  |  |  |  |  | $ 9.0 kmpr_InvestmentIncomeEquityMethodLimitedLiabilityInvestments | $ 26.4 kmpr_InvestmentIncomeEquityMethodLimitedLiabilityInvestments | $ 9.3 kmpr_InvestmentIncomeEquityMethodLimitedLiabilityInvestments
Fair Value Option Investments |  |  |  |  |  |  |  |  | (0.7)kmpr_InvestmentIncomeFairValueOptionInvestments | 0 kmpr_InvestmentIncomeFairValueOptionInvestments | 0 kmpr_InvestmentIncomeFairValueOptionInvestments
Short-term Investments |  |  |  |  |  |  |  |  | 0.6 kmpr_InvestmentIncomeShortTermInvestments | 0.1 kmpr_InvestmentIncomeShortTermInvestments | 0.2 kmpr_InvestmentIncomeShortTermInvestments
Real Estate |  |  |  |  |  |  |  |  | 12.1 kmpr_InvestmentIncomeRealEstate | 20.8 kmpr_InvestmentIncomeRealEstate | 27.4 kmpr_InvestmentIncomeRealEstate
Loans to Policyholders |  |  |  |  |  |  |  |  | 20.5 kmpr_InvestmentIncomeLoansToPolicyholders | 19.8 kmpr_InvestmentIncomeLoansToPolicyholders | 18.9 kmpr_InvestmentIncomeLoansToPolicyholders
Other |  |  |  |  |  |  |  |  | 0.1 kmpr_InvestmentIncomeOther | 0 kmpr_InvestmentIncomeOther | 0.1 kmpr_InvestmentIncomeOther
Total Investment Income |  |  |  |  |  |  |  |  | 328.9 kmpr_GrossInvestmentIncome | 340.6 kmpr_GrossInvestmentIncome | 327.7 kmpr_GrossInvestmentIncome
Investment Expenses: |  |  |  |  |  |  |  |  |  |  |
Other Investment Expenses |  |  |  |  |  |  |  |  | 19.8 us-gaap_InvestmentIncomeInvestmentExpense | 25.9 us-gaap_InvestmentIncomeInvestmentExpense | 31.8 us-gaap_InvestmentIncomeInvestmentExpense
Net Investment Income | 93.1 us-gaap_NetInvestmentIncome | 72.3 us-gaap_NetInvestmentIncome | 72.6 us-gaap_NetInvestmentIncome | 71.1 us-gaap_NetInvestmentIncome | 76.9 us-gaap_NetInvestmentIncome | 82.4 us-gaap_NetInvestmentIncome | 74.6 us-gaap_NetInvestmentIncome | 80.8 us-gaap_NetInvestmentIncome | 309.1 us-gaap_NetInvestmentIncome | 314.7 us-gaap_NetInvestmentIncome | 295.9 us-gaap_NetInvestmentIncome
Accrued Investment Income Receivable | 65.5 us-gaap_AccruedInvestmentIncomeReceivable |  |  |  | 66.7 us-gaap_AccruedInvestmentIncomeReceivable |  |  |  | 65.5 us-gaap_AccruedInvestmentIncomeReceivable | 66.7 us-gaap_AccruedInvestmentIncomeReceivable |
Real Estate Investment [Member] |  |  |  |  |  |  |  |  |  |  |
Investment Expenses: |  |  |  |  |  |  |  |  |  |  |
Other Investment Expenses |  |  |  |  |  |  |  |  | 11.3 us-gaap_InvestmentIncomeInvestmentExpense / invest_InvestmentAxis = us-gaap_RealEstateInvestmentMember | 18.3 us-gaap_InvestmentIncomeInvestmentExpense / invest_InvestmentAxis = us-gaap_RealEstateInvestmentMember | 26.1 us-gaap_InvestmentIncomeInvestmentExpense / invest_InvestmentAxis = us-gaap_RealEstateInvestmentMember
Other Investment [Member] |  |  |  |  |  |  |  |  |  |  |
Investment Expenses: |  |  |  |  |  |  |  |  |  |  |
Other Investment Expenses |  |  |  |  |  |  |  |  | 8.5 us-gaap_InvestmentIncomeInvestmentExpense / invest_InvestmentAxis = kmpr_OtherInvestmentMember | 7.6 us-gaap_InvestmentIncomeInvestmentExpense / invest_InvestmentAxis = kmpr_OtherInvestmentMember | 5.7 us-gaap_InvestmentIncomeInvestmentExpense / invest_InvestmentAxis = kmpr_OtherInvestmentMember
Fixed Maturities [Member] |  |  |  |  |  |  |  |  |  |  |
Investment Income: |  |  |  |  |  |  |  |  |  |  |
Interest and Dividends on Fixed Maturities |  |  |  |  |  |  |  |  | 227.4 us-gaap_InvestmentIncomeInterestAndDividend / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember | 235.5 us-gaap_InvestmentIncomeInterestAndDividend / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember | 246.1 us-gaap_InvestmentIncomeInterestAndDividend / us-gaap_InvestmentTypeAxis = us-gaap_FixedMaturitiesMember
Equity Securities [Member] |  |  |  |  |  |  |  |  |  |  |
Investment Income: |  |  |  |  |  |  |  |  |  |  |
Dividends on Equity Securities |  |  |  |  |  |  |  |  | $ 59.9 us-gaap_InvestmentIncomeDividend / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember | $ 38.0 us-gaap_InvestmentIncomeDividend / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember | $ 25.7 us-gaap_InvestmentIncomeDividend / us-gaap_InvestmentTypeAxis = us-gaap_EquitySecuritiesMember

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