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Reinsurance Reinsurance (Schedule of Trust Assets and Reinsurance Liabilities) (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
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Summary Of Significant Accounting Policies [Line Items] |  |  |
Restricted cash and cash equivalents |  | $ 273.6 | $ 224.7
Restricted securities available for sale | [1] | 46.1 | 45.3
Accounts payable and accrued liabilities |  | 140.5 | 143.9
Trust Assets [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Restricted cash and cash equivalents |  | 0.7 | 0.5
Restricted securities available for sale |  | 46.1 | 45.3
Unearned Premium [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Accounts payable and accrued liabilities |  | 33.5 | 32.8
Claims Reserve [Member] |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Accounts payable and accrued liabilities | [2] | $ 1.1 | $ 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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