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Reinsurance (Net Receivables) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Insurance [Abstract]    
Claims recoverable from reinsurers $ 2,153.8 $ 2,276.3
Reinsured amounts due to reinsurers (0.3) (0.3)
Other 0.2 0.3
Total $ 2,153.7 $ 2,276.3