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Debt - Debt Outstanding (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Notes Payable $ 752.1us-gaap_NotesPayable $ 606.9us-gaap_NotesPayable
Senior Notes [Member] | Senior Notes, 6% Due November 30, 2015 [Member]    
Debt Instrument [Line Items]    
Notes Payable 249.5us-gaap_NotesPayable
/ us-gaap_DebtInstrumentAxis
= kmpr_SeniorNotes6PercentDueNovember302015Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 249.0us-gaap_NotesPayable
/ us-gaap_DebtInstrumentAxis
= kmpr_SeniorNotes6PercentDueNovember302015Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Senior Notes [Member] | Senior Notes, 6% Due May 15, 2017 [Member]    
Debt Instrument [Line Items]    
Notes Payable 358.5us-gaap_NotesPayable
/ us-gaap_DebtInstrumentAxis
= kmpr_SeniorNotes6PercentDueMay152017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember		 357.9us-gaap_NotesPayable
/ us-gaap_DebtInstrumentAxis
= kmpr_SeniorNotes6PercentDueMay152017Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Subordinated Debt [Member] | Subordinated Debenture, 7.375 Percent Due 2054 [Member]    
Debt Instrument [Line Items]    
Notes Payable $ 144.1us-gaap_NotesPayable
/ us-gaap_DebtInstrumentAxis
= kmpr_SubordinatedDebenture7.375PercentDue2054Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember		 $ 0us-gaap_NotesPayable
/ us-gaap_DebtInstrumentAxis
= kmpr_SubordinatedDebenture7.375PercentDue2054Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember