Shareholders' Equity (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of Capitalization, Equity [Line Items]
Preferred Stock, shares authorized	20,000,000
Par value of preferred stock (per share)	$ 0.1
Common stock, shares authorized	100,000,000	100,000,000
Par value of common stock (per share)	$ 0.1	$ 0.1
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, shares outstanding	52,418,246	55,653,437
Stock Repurchased and retired during period, Shares	(3,200,000)	(3,000,000)	(2,000,000)
Repurchases of common stock	$ (115,500,000)	$ (100,400,000)	$ (60,700,000)
Company Action Level RBC, as Percentage of Authorized Control Level RBC	200.00%
Dividends paid	51,800,000	54,900,000	56,900,000
Amount available for dividend payment	268,000,000
Kemper's Insurance Subsidiaries [Member]
Schedule of Capitalization, Equity [Line Items]
Cash dividends paid by Kemper's Insurance Subsidiaries to Kemper	217,500,000
Amount available for dividend payments	218,000,000
Amount of restricted net assets for consolidated and unconsolidated subsidiaries	2,400,000,000
Life and Health [Member]
Schedule of Capitalization, Equity [Line Items]
Statutory capital and surplus for the Company’s life and health insurance subsidiaries	437,300,000	430,200,000
Statutory net income for the Company’s life and health insurance subsidiaries	100,700,000	81,500,000	102,000,000
Statutory capital and surplus required	125,400,000
Property and Casualty Insurance [Member]
Schedule of Capitalization, Equity [Line Items]
Statutory capital and surplus for the Company’s life and health insurance subsidiaries	947,500,000	989,700,000
Statutory net income for the Company’s life and health insurance subsidiaries	85,700,000	138,800,000	40,600,000
Statutory capital and surplus required	$ 288,700,000
Restricted Stock [Member]
Schedule of Capitalization, Equity [Line Items]
Common stock, shares outstanding	163,720	278,427