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Reinsurance (Schedule of Trust Assets and Reinsurance Liabilities) - USD ($) $ in Millions		Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Reinsurance [Line Items]
Restricted cash and cash equivalents		$ 426.7	$ 410.9	$ 477.4	$ 380.2
Debt Securities, Available-for-sale, Restricted		66.0	62.1
Trust Assets [Member]
Reinsurance [Line Items]
Restricted cash and cash equivalents		1.0	0.3
Debt Securities, Available-for-sale, Restricted		66.0	62.1
Unearned Premium [Member]
Reinsurance [Line Items]
Accounts payable and accrued liabilities		52.2	44.6
Claims Reserve [Member]
Reinsurance [Line Items]
Accounts payable and accrued liabilities	[1]	$ 2.9	$ 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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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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