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Business Segments - Amortization of Deferred Policy Acquisitions Costs By Segment (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Segment Reporting Information [Line Items]      
Amortization of Deferred Policy Acquisition Costs $ 299.3 $ 257.4 $ 235.4
Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Amortization of Deferred Policy Acquisition Costs 299.3 257.4 235.4
Property and Casualty Insurance [Member]      
Segment Reporting Information [Line Items]      
Amortization of Deferred Policy Acquisition Costs 252.1 213.1 187.5
Life and Health Insurance [Member]      
Segment Reporting Information [Line Items]      
Amortization of Deferred Policy Acquisition Costs $ 47.2 $ 44.3 $ 47.9