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Stockholders' Equity - AOCI and Noncontrolling Interest (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Change in accumulated other comprehensive income (loss) rollforward
Balances	$ 11,086.4
Balances	11,216.8
Change in redeemable noncontrolling interest rollforward
Redeemable noncontrolling interest, balance at beginning of period	337.7	$ 248.9
Net income (loss) attributable to redeemable noncontrolling interest	11.5	(2.0)
Redeemable noncontrolling interest of deconsolidated entities	(12.5)	(90.0)
Contributions from redeemable noncontrolling interest	30.8	226.2
Distributions to redeemable noncontrolling interest	(31.8)	(14.2)
Purchase of subsidiary shares from redeemable noncontrolling interest	(1.6)
Change in redemption value of redeemable noncontrolling interest		2.1
Other comprehensive income (loss) attributable to redeemable noncontrolling interest	(7.4)	(0.2)
Redeemable noncontrolling interest, balance at end of period	326.7	370.8
Accumulated other comprehensive income (loss)
Change in accumulated other comprehensive income (loss) rollforward
Balances	(5,224.8)	(5,345.3)
Other comprehensive income (loss) during the period, net of adjustments	387.1	51.9
Amounts reclassified from AOCI	51.8	37.3
Other comprehensive income (loss)	438.9	89.2
Balances	(4,785.9)	(5,256.1)
Net unrealized gains (losses) on available-for-sale securities
Change in accumulated other comprehensive income (loss) rollforward
Balances	(4,692.9)	(4,014.8)
Other comprehensive income (loss) during the period, net of adjustments	540.0	(393.1)
Amounts reclassified from AOCI	49.4	34.5
Other comprehensive income (loss)	589.4	(358.6)
Balances	(4,103.5)	(4,373.4)
Net unrealized gains (losses) on available-for-sale debt securities with allowance for credit losses	4.0	2.5
Net unrealized gains (losses) on derivative instruments
Change in accumulated other comprehensive income (loss) rollforward
Balances	51.8	(2.1)
Other comprehensive income (loss) during the period, net of adjustments	14.6	18.2
Amounts reclassified from AOCI	(0.5)	(0.7)
Other comprehensive income (loss)	14.1	17.5
Balances	65.9	15.4
Liability for future policy benefits discount rate remeasurement gain (loss)
Change in accumulated other comprehensive income (loss) rollforward
Balances	1,438.2	428.2
Other comprehensive income (loss) during the period, net of adjustments	(249.8)	554.7
Other comprehensive income (loss)	(249.8)	554.7
Balances	1,188.4	982.9
Market risk benefit nonperformance risk remeasurement gain (loss)
Change in accumulated other comprehensive income (loss) rollforward
Balances	(15.0)	(6.9)
Other comprehensive income (loss) during the period, net of adjustments	2.1	(8.7)
Other comprehensive income (loss)	2.1	(8.7)
Balances	(12.9)	(15.6)
Foreign currency translation adjustment
Change in accumulated other comprehensive income (loss) rollforward
Balances	(1,785.9)	(1,498.0)
Other comprehensive income (loss) during the period, net of adjustments	80.2	(119.2)
Other comprehensive income (loss)	80.2	(119.2)
Balances	(1,705.7)	(1,617.2)
Unrecognized postretirement benefit obligations
Change in accumulated other comprehensive income (loss) rollforward
Balances	(221.0)	(251.7)
Amounts reclassified from AOCI	2.9	3.5
Other comprehensive income (loss)	2.9	3.5
Balances	$ (218.1)	$ (248.2)

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Amount, before tax, of accumulated unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) with allowance for credit loss.

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