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Reinsurance (Schedule of Trust Assets and Reinsurance Liabilities) - USD ($) $ in Millions		Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020
Reinsurance [Line Items]
Restricted cash and cash equivalents		$ 384.7	$ 410.9	$ 429.0	$ 380.2
Debt Securities, Available-for-sale, Restricted		68.0	62.1
Trust Assets [Member]
Reinsurance [Line Items]
Restricted cash and cash equivalents		1.5	0.3
Debt Securities, Available-for-sale, Restricted		68.0	62.1
Unearned Premium [Member]
Reinsurance [Line Items]
Accounts payable and accrued liabilities		54.6	44.6
Claims Reserve [Member]
Reinsurance [Line Items]
Accounts payable and accrued liabilities	[1]	$ 3.2	$ 2.4
[1] The claims reserve represents our liability for incurred-but-not-reported claims and is estimated based on historical claims experience.

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Summary Of Significant Accounting Policies [Line Items]

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