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Summary of Significant Accounting Policies (Schedule of Trust Assets and Reinsurance Liabilities) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Summary Of Significant Accounting Policies [Line Items]    
Restricted cash and cash equivalents $ 156.6 $ 111.3
Restricted securities available for sale 54.6 53.6
Accounts payable and accrued liabilities 110.1 113.8
Trust Assets [Member]
    
Summary Of Significant Accounting Policies [Line Items]    
Restricted cash and cash equivalents 0.4 1.2
Restricted securities available for sale 54.6 53.6
Unearned Premium [Member]
    
Summary Of Significant Accounting Policies [Line Items]    
Accounts payable and accrued liabilities 41.2 42.4
Claims Reserve [Member]
    
Summary Of Significant Accounting Policies [Line Items]    
Accounts payable and accrued liabilities $ 1.8 [1] $ 1.7 [1]
[1] The claims reserve is estimated based on historical claims experience.