XML 79 R62.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Investments - Amortized Cost and Estimated Fair Value of investments (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 6,284,500,000 | $ 5,021,600,000
Gross Unrealized Gains | 226,300,000 | 380,600,000
Gross Unrealized Losses | (86,600,000) | (19,500,000)
Fair Value | 6,424,200,000 | 5,382,700,000
Accrued Expenses and Other Liabilities | 697,300,000 | 453,700,000
Other Receivables | 245,400,000 | 194,300,000
Available-for-sale-Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Securities that have had Recognized Credit Losses in Earnings, Aggregate Losses | 0 | 0
Equity Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Accrued Expenses and Other Liabilities | 0 |
Other Receivables | 0 |
Investments in Fixed Maturities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Accrued Expenses and Other Liabilities | 10,500,000 | 5,400,000
Other Receivables | 500,000 | 0
US Government and Government Agencies and Authorities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 865,900,000 | 542,700,000
Gross Unrealized Gains | 14,800,000 | 19,600,000
Gross Unrealized Losses | (15,000,000) | (6,200,000)
Fair Value | 865,700,000 | 556,100,000
States and Political Subdivisions [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,553,700,000 | 1,595,500,000
Gross Unrealized Gains | 74,000,000 | 108,600,000
Gross Unrealized Losses | (8,600,000) | (2,300,000)
Fair Value | 1,619,100,000 | 1,701,800,000
Debt Security, Government, Non-US [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 6,500,000 | 3,000,000
Gross Unrealized Gains | 0 | 200,000
Gross Unrealized Losses | (600,000) | 0
Fair Value | 5,900,000 | 3,200,000
Corporate Bonds and Notes [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 3,307,800,000 | 2,745,800,000
Gross Unrealized Gains | 135,100,000 | 245,800,000
Gross Unrealized Losses | (49,100,000) | (11,000,000)
Fair Value | 3,393,800,000 | 2,980,600,000
Redeemable Preferred Stocks [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost |  | 100,000
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Fair Value |  | 100,000
Collateralized Loan Obligations [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 535,700,000 | 134,100,000
Gross Unrealized Gains | 1,500,000 | 5,700,000
Gross Unrealized Losses | (13,200,000) | 0
Fair Value | 524,000,000 | 139,800,000
Other Mortgage and Asset-backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 14,900,000 | 400,000
Gross Unrealized Gains | 900,000 | 700,000
Gross Unrealized Losses | (100,000) | 0
Fair Value | $ 15,700,000 | $ 1,100,000

X
- Definition Available For Sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Securities that have had Recognized Credit Losses in Earnings, Aggregate Losses + References No definition available. + Details
Name: | kmpr_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerSecuritiesThatHaveHadRecognizedCreditLossesInEarningsAggregateLosses
Namespace Prefix: | kmpr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesDebtSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of liabilities classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_OtherLiabilities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount due from parties in nontrade transactions, classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_OtherReceivables
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_DebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_USTreasuryAndGovernmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_USStatesAndPoliticalSubdivisionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_ForeignGovernmentDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_MandatorilyRedeemablePreferredStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CollateralizedLoanObligationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=kmpr_OtherMortgageandAssetbackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |