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Interim financial statements - Merger Agreement (Details)
12 Months Ended
Mar. 18, 2018
USD ($)
day
$ / shares
Dec. 31, 2017
USD ($)
$ / shares
Jun. 30, 2018
$ / shares
Mar. 31, 2018
$ / shares
Business Acquisition [Line Items]        
Common stock, par value (in usd per share)   $ 1 $ 1  
Termination fee to be paid by the Company | $ $ 33,000,000      
FNF        
Business Acquisition [Line Items]        
Cash consideration to be received (in usd per share) $ 25.00      
Common stock portion, conversion ratio of shares 0.6425      
Common stock, par value (in usd per share)       $ 0.0001
Percentage of cash consideration 50.00%      
Percentage of stock consideration 50.00%      
Parent share price (in usd per share) $ 38.91      
Weighted average price of common stock, trading days | day 20      
Reduction in share price (in usd per share) $ 4.50      
Percentage of reduction in cash consideration 50.00%      
Percentage of reduction in stock consideration 50.00%      
Termination fee to be paid by FNF | $ $ 50,000,000      
FNF | Minimum        
Business Acquisition [Line Items]        
Annual revenues, divestiture of assets or businesses for regulatory approval | $   $ 75,000,000    
FNF | Maximum        
Business Acquisition [Line Items]        
Annual revenues, divestiture of assets or businesses for regulatory approval | $   $ 225,000,000    
FNF | Cash Election Consideration        
Business Acquisition [Line Items]        
Cash consideration to be received (in usd per share) $ 50.00      
FNF | Stock Election Consideration        
Business Acquisition [Line Items]        
Common stock portion, conversion ratio of shares 1.2850