Summary Of Significant Accounting Policies (Schedule Of Trust Assets And Reinsurance Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Summary Of Significant Accounting Policies [Line Items]
Restricted cash and cash equivalents	$ 157.6		$ 111.3
Restricted securities available for sale	53.2		53.6
Accounts payable and accrued liabilities	114.4		113.8
Trust Assets [Member]
Summary Of Significant Accounting Policies [Line Items]
Restricted cash and cash equivalents	0.2		1.2
Restricted securities available for sale	53.2		53.6
Unearned Premium [Member]
Summary Of Significant Accounting Policies [Line Items]
Accounts payable and accrued liabilities	38.4		42.4
Claims Reserve [Member]
Summary Of Significant Accounting Policies [Line Items]
Accounts payable and accrued liabilities	$ 1.5	[1]	$ 1.7	[1]

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