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Contingencies - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended
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Apr. 30, 2019 | Sep. 30, 2018 | Nov. 30, 2017
Commitments and Contingencies Disclosure [Abstract] |  |  |
Gain contingency, unrecorded amount |  |  | $ 84.3
Litigation settlement, interest rate |  |  | 9.00%
Litigation settlement, expense |  |  | $ 7.2
Litigation settlement, amount awarded from other party |  | $ 141.7 |
Proceeds from legal settlements | $ 20.1 | $ 35.7 |

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- Definition Litigation Settlement, Interest Rate + References No definition available. + Details
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Namespace Prefix: | kmpr_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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- Definition The amount or range of possible amounts of gain that could be realized upon the resolution of a contingency. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6397426&loc=d3e17499-108355 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount awarded from other party in judgment or settlement of litigation. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Cash received for the settlement of litigation during the current period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3536-108585 + Details
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Balance Type: | debit
Period Type: | duration