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Acquisition of Business - Narrative (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Jul. 02, 2018
Business Acquisition [Line Items]      
Goodwill $ 1,114.0 $ 1,112.4  
Infinity Property and Casualty Corporation      
Business Acquisition [Line Items]      
Business acquisition, percentage of voting interests acquired     100.00%
Business combination, recognized identifiable assets acquired and liabilities assumed, legal accruals, other liabilities and tax related balance 2.7    
Business combination, recognized identifiable assets acquired and liabilities assumed, deferred tax liabilities, current 0.2    
Goodwill $ 2.5   $ 791.0