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Schedule II Financial Information of Registrant Parent Company Parenthetical (Details) - USD ($)
$ / shares in Units, $ in Millions
Dec. 31, 2018
Dec. 31, 2017
Parent Company    
Condensed Financial Statements, Captions [Line Items]    
Common Stock, Par or Stated Value Per Share $ 0.001 $ 0.001
Common Stock, Shares Authorized 485,000,000 485,000,000
Common Stock, Shares, Issued 231,132,000 233,417,000
Common Stock, Shares, Outstanding 213,473,000 215,814,000
Treasury Stock, Shares 17,660,000 17,603,000
Clayton Group Holdings Inc.    
Condensed Financial Statements, Captions [Line Items]    
Notes Receivable, Related Parties $ 300.0 $ 300.0
Radian Guaranty    
Condensed Financial Statements, Captions [Line Items]    
Surplus Notes $ 100.0 $ 100.0