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Income Taxes - Effective Income Tax Rate In Percentage (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Reconciliation between the U.S. corporate income tax rate and the effective income tax rate
Income (loss) before income taxes	$ 248.4	$ (293.8)	$ 780.4	$ 777.2
Expected tax at the U.S. statutory rate	52.2	(61.7)	163.9	163.2
Tax credits	(19.1)	(19.9)	(71.3)	(54.8)
Dividends received deduction	(23.1)	(19.3)	(61.1)	(57.0)
Impact of equity method presentation	(7.2)	(9.8)	(18.0)	(20.9)
Interest exclusion from taxable income	(6.2)	(5.9)	(17.1)	(17.8)
Impact of noncontrolling interest presentation	(4.3)	(5.6)	(13.1)	(6.3)
Changes in unrecognized tax benefits - Tax Cuts and Jobs Act of 2017 rate change			(5.4)
Local country permanent tax adjustments	0.3	(6.6)	(2.5)	(4.4)
Low income housing tax credit amortization	9.7	11.9	34.1	32.9
State income taxes	6.5	5.3	18.2	27.4
Foreign country statutory rate differential	4.1	6.0	17.1	2.8
Valuation allowance	2.2	3.3	3.5	18.7
Other	(0.6)	1.9	1.8	(2.0)
Income taxes (benefits)	$ 14.5	$ (100.4)	$ 50.1	$ 81.8
Effective income tax rate (as a percent)	6.00%	34.00%	6.00%	11.00%

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