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SCHEDULE V VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Reinsurance recoverable on paid losses: Allowance for reinsurance balances      
VALUATION AND QUALIFYING ACCOUNTS      
Balance at beginning of period $ 2.2 $ 14.3 $ 25.6
Charged to costs and expenses (0.1) (0.5) 0.0
Charged to other accounts 0.0 0.0 0.0
Deductions described (1.4) (11.6) (11.3)
Balance at end of period 0.7 2.2 14.3
Property and casualty insurance and reinsurance premiums receivable: Allowance for uncollectible accounts      
VALUATION AND QUALIFYING ACCOUNTS      
Balance at beginning of period 1.9 3.1 4.4
Charged to costs and expenses 0.8 (0.2) 0.3
Charged to other accounts (0.7) (1.0) 0.0
Deductions described 0.0 0.0 (1.6)
Balance at end of period 2.0 1.9 3.1
Allowance for Doubtful Accounts [Member]      
VALUATION AND QUALIFYING ACCOUNTS      
Balance at beginning of period 3.3 0.0  
Charged to costs and expenses 3.2 (3.6)  
Charged to other accounts 0.0 0.0  
Deductions described (0.7) 0.3  
Balance at end of period $ 5.8 $ 3.3 $ 0.0