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Income Taxes - Effective Income Tax Rate In Percentage (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Reconciliation between the U.S. corporate income tax rate and the effective income tax rate
Income (loss) before income taxes	$ 28.9	$ 627.1
Expected tax at the U.S. statutory rate	6.1	131.7
Tax credits	(29.6)	(16.2)
Dividends received deduction	(18.2)	(19.4)
Impact of equity method presentation	(5.7)	(4.7)
Interest exclusion from taxable income	(5.2)	(5.8)
Employee compensation	(3.4)	(3.6)
Low income housing tax credit amortization	12.2	10.6
Foreign country statutory rate differential	9.6	(2.4)
State income taxes	1.9	4.7
Other	(1.7)	0.2
Income taxes (benefits)	$ (34.0)	$ 95.1
Effective income tax rate (as a percent)	(118.00%)	15.00%

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Amount 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 employee compensation.

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