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Reinsurance (Schedule of Trust Assets and Reinsurance Liabilities) (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Restricted cash and cash equivalents |  | $ 368.5 | $ 255.6 | $ 316.7 | $ 224.7
Restricted securities available for sale | [1] | 51.3 | 46.1 |  |
Accounts payable and accrued liabilities |  | 168.9 | 151.7 |  |
Trust Assets [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Restricted cash and cash equivalents |  | 1.5 | 0.8 |  |
Restricted securities available for sale |  | 51.3 | 46.1 |  |
Unearned Premium [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Accounts payable and accrued liabilities |  | 40.0 | 34.1 |  |
Claims Reserve [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Accounts payable and accrued liabilities | [2] | $ 1.0 | $ 1.0 |  |
[1] | Measured and recorded at fair value on a recurring basis.
[2] | The claims reserve represents our liability for incurred-but-not-reported claims and 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 + Details
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