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Summary of Significant Accounting Policies Goodwill and Intangible Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Goodwill [Roll Forward]    
Goodwill $ 175.1 $ 174.0
Acquisitions 0.0 1.1
Impairments 0.0 0.0
Goodwill 175.1 175.1
General Insurance Segment [Member]    
Goodwill [Roll Forward]    
Goodwill 116.2 116.2
Acquisitions 0.0 0.0
Impairments 0.0 0.0
Goodwill 116.2 116.2
Title Insurance Group [Member]    
Goodwill [Roll Forward]    
Goodwill 58.7 57.5
Acquisitions 0.0 1.1
Impairments 0.0 0.0
Goodwill 58.7 58.7
Corporate & Other [Member]    
Goodwill [Roll Forward]    
Goodwill 0.1 0.1
Acquisitions 0.0 0.0
Impairments 0.0 0.0
Goodwill $ 0.1 $ 0.1