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Summary of Significant Accounting Policies Goodwill and Intangible Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Goodwill [Roll Forward]    
Goodwill $ 160.7 $ 160.7
Acquisitions 0.0 0.0
Impairments 0.0 0.0
Goodwill 160.7 160.7
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 44.3 44.3
Acquisitions 0.0 0.0
Impairments 0.0 0.0
Goodwill 44.3 44.3
RFIG Run-off Business [Member]    
Goodwill [Roll Forward]    
Goodwill 0.0 0.0
Acquisitions 0.0 0.0
Impairments 0.0 0.0
Goodwill 0.0 0.0
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