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Stockholders' Equity - AOCI and Noncontrolling Interest (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Change in accumulated other comprehensive income (loss) rollforward
Balances			$ 11,086.4
Balances	$ 11,665.5		11,665.5
Change in redeemable noncontrolling interest rollforward
Redeemable noncontrolling interest, balance at beginning of period	391.2	$ 277.4	337.7	$ 248.9
Net income (loss) attributable to redeemable noncontrolling interest	18.4	14.3	55.8	15.1
Redeemable noncontrolling interest of deconsolidated entities			(22.9)	(185.5)
Contributions from redeemable noncontrolling interest	18.4	34.2	107.3	275.3
Distributions to redeemable noncontrolling interest	(11.0)	(14.8)	(56.1)	(42.8)
Purchase of subsidiary shares from redeemable noncontrolling interest	(2.9)		(4.5)	(0.6)
Change in redemption value of redeemable noncontrolling interest		(0.7)		0.4
Stock-based compensation attributable to redeemable noncontrolling interest			0.1	0.1
Other comprehensive income (loss) attributable to redeemable noncontrolling interest	(4.0)	1.4	(7.3)	0.9
Redeemable noncontrolling interest, balance at end of period	410.1	311.8	410.1	311.8
Accumulated other comprehensive income (loss)
Change in accumulated other comprehensive income (loss) rollforward
Balances	(4,713.3)	(5,411.8)	(5,224.8)	(5,345.3)
Other comprehensive income (loss) during the period, net of adjustments	389.4	815.4	811.0	673.8
Amounts reclassified from AOCI	17.3	11.4	107.2	86.5
Other comprehensive income (loss)	406.7	826.8	918.2	760.3
Balances	(4,306.6)	(4,585.0)	(4,306.6)	(4,585.0)
Net unrealized gains (losses) on available-for-sale securities
Change in accumulated other comprehensive income (loss) rollforward
Balances	(3,854.6)	(4,894.2)	(4,692.9)	(4,014.8)
Other comprehensive income (loss) during the period, net of adjustments	674.9	2,106.5	1,428.8	1,158.1
Amounts reclassified from AOCI	16.7	8.4	101.1	77.4
Other comprehensive income (loss)	691.6	2,114.9	1,529.9	1,235.5
Balances	(3,163.0)	(2,779.3)	(3,163.0)	(2,779.3)
Net unrealized gains (losses) on available-for-sale debt securities with allowance for credit losses	(4.7)	(2.6)	(4.7)	(2.6)
Net unrealized gains (losses) on derivative instruments
Change in accumulated other comprehensive income (loss) rollforward
Balances	(98.8)	39.4	51.8	(2.1)
Other comprehensive income (loss) during the period, net of adjustments	71.8	(37.3)	(77.9)	5.6
Amounts reclassified from AOCI	(2.5)	(0.7)	(3.4)	(2.1)
Other comprehensive income (loss)	69.3	(38.0)	(81.3)	3.5
Balances	(29.5)	1.4	(29.5)	1.4
Liability for future policy benefits discount rate remeasurement gain (loss)
Change in accumulated other comprehensive income (loss) rollforward
Balances	1,105.9	1,376.4	1,438.2	428.2
Other comprehensive income (loss) during the period, net of adjustments	(363.3)	(1,317.4)	(695.6)	(369.2)
Other comprehensive income (loss)	(363.3)	(1,317.4)	(695.6)	(369.2)
Balances	742.6	59.0	742.6	59.0
Market risk benefit nonperformance risk remeasurement gain (loss)
Change in accumulated other comprehensive income (loss) rollforward
Balances	(13.3)	(14.5)	(15.0)	(6.9)
Other comprehensive income (loss) during the period, net of adjustments	(4.6)	(5.3)	(2.9)	(12.9)
Other comprehensive income (loss)	(4.6)	(5.3)	(2.9)	(12.9)
Balances	(17.9)	(19.8)	(17.9)	(19.8)
Foreign currency translation adjustment
Change in accumulated other comprehensive income (loss) rollforward
Balances	(1,627.8)	(1,672.5)	(1,785.9)	(1,498.0)
Other comprehensive income (loss) during the period, net of adjustments	10.6	68.9	168.7	(105.6)
Other comprehensive income (loss)	10.6	68.9	168.7	(105.6)
Balances	(1,617.2)	(1,603.6)	(1,617.2)	(1,603.6)
Unrecognized postretirement benefit obligations
Change in accumulated other comprehensive income (loss) rollforward
Balances	(224.7)	(246.4)	(221.0)	(251.7)
Other comprehensive income (loss) during the period, net of adjustments			(10.1)	(2.2)
Amounts reclassified from AOCI	3.1	3.7	9.5	11.2
Other comprehensive income (loss)	3.1	3.7	(0.6)	9.0
Balances	$ (221.6)	$ (242.7)	$ (221.6)	$ (242.7)

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