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Income Taxes (Summary Of Effective Income Tax Rate On Continuing Operations) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]
Bermuda statutory income tax rate	0.00%	0.00%	0.00%
Non-Bermuda taxes	25.60%	74.00%	22.80%
Valuation allowance	(2.30%)	(953.60%)	0.60%
Resolution of prior year items	(23.20%)	(49.90%)	(7.00%)
Other	0.00%	0.00%	2.80%
Effective income tax rate	0.10%	(929.50%)	19.20%
Income Tax Expense (Benefit), Discrete Item	$ 85.8	$ 42.0	$ 10.3

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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