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Allocation of Purchase Price (Detail)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2011
USD ($)
Jul. 14, 2011
USD ($)
Jul. 14, 2011
GBP (£)
Jun. 30, 2011
Chaucer
USD ($)
Business Acquisition [Line Items]        
Cash $ 756.1      
Premiums and accounts receivable, net 469.5      
Investments 1,630.8      
Reinsurance recoverables, net 569.8      
Deferred acquisition costs 171.9      
Deferred income taxes 52.4      
Other assets 18.1      
Loss and loss adjustment expense reserves (2,300.6)      
Unearned premiums (857.3)      
Debt (63.3)      
Other liabilities (64.4)      
Net tangible assets 383.0      
Goodwill 6.0      
Intangible assets 87.7      
Additional hedge-related adjustment based upon July 14, 2011 settlement 4.9 11.3    
Total purchase price, excluding transaction costs 481.6      
Transaction costs 11.7      
Total purchase price $ 493.3 $ 481.6 £ 296.9 $ 476.7