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Reinsurance (Schedule of Trust Assets and Reinsurance Liabilities) (Details) - USD ($) $ in Millions		Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021
Reinsurance [Line Items]
Restricted cash and cash equivalents		$ 435.1	$ 410.0	$ 384.7	$ 410.9
Debt Securities, Available-for-sale, Restricted		86.2	72.3
Trust Assets [Member]
Reinsurance [Line Items]
Restricted cash and cash equivalents		1.7	0.4
Debt Securities, Available-for-sale, Restricted		86.2	72.3
Unearned Premium [Member]
Reinsurance [Line Items]
Accounts payable and accrued liabilities		67.9	54.4
Claims Reserve [Member]
Reinsurance [Line Items]
Accounts payable and accrued liabilities	[1]	$ 5.7	$ 3.1
[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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Amount of restricted investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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