Summary Of Significant Accounting Policies (Schedule Of Trust Assets And Reinsurance Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Summary Of Significant Accounting Policies [Line Items]
Restricted cash and cash equivalents	$ 146.6		$ 111.3
Restricted securities available for sale	52.3		53.6
Accounts payable and accrued liabilities	111.4		113.8
Trust Assets [Member]
Summary Of Significant Accounting Policies [Line Items]
Restricted cash and cash equivalents	2.6		1.2
Restricted securities available for sale	52.3		53.6
Unearned Premium [Member]
Summary Of Significant Accounting Policies [Line Items]
Accounts payable and accrued liabilities	43.9		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.