Income From Continuing Operations Per Unrestricted Share (Details) (USD $) In Millions, except Share data, 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
Schedule of Basic and Diluted Earnings Per Share [Line Items]
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
Dilutive Effect on Income of Kemper Equity-based Compensation Equivalent Shares									0	0	0
Diluted Income from Continuing Operations Attributed to Unrestricted Shares									213.4	91.3	61.4
Weighted-Average Unrestricted Shares Outstanding									56,856,900	58,857,300	60,262,600
Kemper Equity-based Compensation Equivalent Shares									126,700	141,700	103,900
Weighted-Average Unrestricted Shares and Equivalent Shares Outstanding Assuming Dilution									56,983,600	58,999,000	60,366,500
Basic Income from Continuing Operations Per Unrestricted Share	$ 0.98	$ 1.21	$ 0.56	$ 1.00	$ (0.03)	$ 0.95	$ 0.03	$ 0.61	$ 3.75	$ 1.55	$ 1.02
Diluted Income from Continuing Operations Per Unrestricted Share	$ 0.98	$ 1.21	$ 0.56	$ 1.00	$ (0.03)	$ 0.95	$ 0.03	$ 0.60	$ 3.74	$ 1.54	$ 1.02
Restricted Stock [Member]
Schedule of Basic and Diluted Earnings Per Share [Line Items]
Income from Continuing Operations									1.1	0.5	0.3
Common Stock [Member]
Schedule of Basic and Diluted Earnings Per Share [Line Items]
Income from Continuing Operations									$ 213.4	$ 91.3	$ 61.4