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Deferred Policy Acquisition Cost (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Business Acquisition [Line Items]      
Deferred beginning of year $ 328.0 $ 325.4 $ 316.3
Acquisition costs deferred; additions 524.6 504.2 541.4
Amortization charged to income (502.2) (501.5) (532.2)
Change for the year 22.4 2.6 9.1
Deferred end of year 350.4 328.0 325.4
Commissions, net of reinsurance [Member]      
Business Acquisition [Line Items]      
Acquisition costs deferred; additions 340.9 326.0 360.8
Premium taxes [Member]      
Business Acquisition [Line Items]      
Acquisition costs deferred; additions 135.2 127.4 130.2
Salaries and other marketing expenses [Member]      
Business Acquisition [Line Items]      
Acquisition costs deferred; additions $ 48.3 $ 50.7 $ 50.3