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Business Segments - Segment Net Income (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Segment Reporting Information [Line Items]                      
Net Operating Income                 $ 159.2 $ 53.8 $ 47.1
Income from Continuing Operations 54.8 68.6 32.5 58.6 (1.7) 55.6 1.6 36.3 214.5 91.8 61.7
Operating Segments [Member]
                      
Segment Reporting Information [Line Items]                      
Net Operating Income                 189.9 79.9 73.6
Kemper Preferred [Member]
                      
Segment Reporting Information [Line Items]                      
Net Operating Income                 63.1 (11.2) (17.6)
Kemper Specialty [Member]
                      
Segment Reporting Information [Line Items]                      
Net Operating Income                 10.4 1.2 19.8
Kemper Direct [Member]
                      
Segment Reporting Information [Line Items]                      
Net Operating Income                 27.1 (0.9) (27.5)
Life and Health Insurance [Member]
                      
Segment Reporting Information [Line Items]                      
Net Operating Income                 89.3 90.8 98.9
Segment Reconciling Items [Member]
                      
Segment Reporting Information [Line Items]                      
Net Operating Income                 (30.7) (26.1) (26.5)
Net Realized Gains on Sale of Investments, Net of Tax                 64.4 42.5 21.9
Net Impairment Losses Recognized in Earnings, Net of Tax                 $ 9.1 $ 4.5 $ 7.3