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Reinsurance (Schedule Of Trust Assets And Reinsurance Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Reinsurance [Line Items]    
Restricted cash and cash equivalents $ 255.6 $ 224.7
Restricted securities available for sale [1] 46.1 45.3
Accounts payable and accrued liabilities 151.7 143.9
Trust Assets [Member]    
Reinsurance [Line Items]    
Restricted cash and cash equivalents 0.8 0.5
Restricted securities available for sale 46.1 45.3
Unearned Premium [Member]    
Reinsurance [Line Items]    
Accounts payable and accrued liabilities 34.1 32.8
Claims Reserve [Member]    
Reinsurance [Line Items]    
Accounts payable and accrued liabilities [2] $ 1.0 $ 1.0
[1] Measured at fair value on a recurring basis.
[2] The claims reserve represents our liability for incurred-but-not-reported claims and is estimated based on historical claims experience.