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Managment and Other Agreements (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Farm Bureau Property & Casualty insurance company [Member]      
Related Party Transaction [Line Items]      
Equipment Expense $ 0.3 $ 0.7 $ 0.9
Management Fees Revenue 2.2 2.3 1.9
Professional and Contract Services Expense 8.6 9.9 9.3
Investment Advisory Fees 2.5 2.3 1.9
Subsidiary of Common Parent [Member]      
Related Party Transaction [Line Items]      
Professional and Contract Services Expense 1.0 1.0 1.0
Majority Shareholder [Member]      
Related Party Transaction [Line Items]      
Royalty Expense $ 0.6 0.6 0.5
Royalty agreement restriction $ 0.10    
Other Farm Bureau organizations [Member]      
Related Party Transaction [Line Items]      
Royalty Expense $ 1.8 1.7 1.7
Subsidiaries [Member]      
Related Party Transaction [Line Items]      
Nonoperating Income (Expense) $ 3.4 $ 3.2 $ 3.2