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Summary of Significant Accounting Policies (Schedule of Trust Assets and Reinsurance Liabilities) (Details) (USD $) In Millions, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
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Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Restricted cash and cash equivalents | $ 205.4 |  | $ 111.3 |
Restricted securities available for sale | 51.4 |  | 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 | 1.5 |  | 1.2 |
Restricted securities available for sale | 51.4 |  | 53.6 |
Unearned Premium [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Accounts payable and accrued liabilities | 39.2 |  | 42.4 |
Claims Reserve [Member] |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Accounts payable and accrued liabilities | $ 1.6 | [1] | $ 1.7 | [1]
[1] | The claims reserve is estimated based on historical claims experience.

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- Definition Sum of the carrying values as of the balance sheet date of obligations incurred through that date, including liabilities incurred and payable to vendors for goods and services received, taxes, interest, rent and utilities, compensation costs, payroll taxes and fringe benefits (other than pension and postretirement obligations), contractual rights and obligations, and statutory obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.15(1),(5)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.15) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph 1, 5 -Article 9 + Details
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