Summary Of Significant Accounting Policies (Schedule Of Trust Assets And Reinsurance Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Summary Of Significant Accounting Policies [Line Items]
Restricted cash and cash equivalents	$ 111.3		$ 92.4
Restricted securities available for sale	53.6		46.1
Accounts payable and accrued liabilities	113.8		105.8
Trust Assets [Member]
Summary Of Significant Accounting Policies [Line Items]
Restricted cash and cash equivalents	1.2		2.2
Restricted securities available for sale	53.6		46.1
Unearned Premium [Member]
Summary Of Significant Accounting Policies [Line Items]
Accounts payable and accrued liabilities	42.4		35.7
Claims Reserve [Member]
Summary Of Significant Accounting Policies [Line Items]
Accounts payable and accrued liabilities	$ 1.7	[1]	$ 1.4	[1]

[1] The claims reserve is estimated based on historical claims experience.