v3.25.3

Accumulated Other Comprehensive Income (Loss) (AOCI) - Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance	$ 5,149.3	$ 4,832.6	$ 4,927.0	$ 4,862.8
Accumulated other comprehensive income (loss), net of tax, Beginning Balance			(496.4)
Change in unrealized losses on debt securities			243.4
Change in foreign currency translation adjustment			27.7
Amortization of net actuarial loss			1.4
Tax effect	(22.9)	(146.9)	(62.3)	(128.7)
Accumulated other comprehensive income (loss), net of tax, Ending Balance	(286.2)		(286.2)
Balance	5,325.2	5,110.6	5,325.2	5,110.6
Unrealized Gains (Losses) on Debt Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance			(353.7)
Change in unrealized losses on debt securities			243.4
Change in foreign currency translation adjustment			0.0
Amortization of net actuarial loss			0.0
Tax effect	(22.9)	(146.4)	(61.3)	(128.5)
Balance	(171.6)		(171.6)
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance			(111.0)
Change in unrealized losses on debt securities			0.0
Change in foreign currency translation adjustment			27.7
Amortization of net actuarial loss			0.0
Tax effect	0.2	(0.4)	(0.6)	0.2
Balance	(83.9)		(83.9)
Pension Benefit Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance			(31.7)
Change in unrealized losses on debt securities			0.0
Change in foreign currency translation adjustment			0.0
Amortization of net actuarial loss			1.4
Tax effect			(0.4)
Balance	(30.7)		(30.7)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance	(345.6)	(729.7)	(496.4)	(655.8)
Balance	$ (286.2)	$ (290.5)	$ (286.2)	$ (290.5)

Amount, after tax, of accumulated increase (decrease) in equity from transaction and other event and circumstance from nonowner source.

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Amount, before tax and after adjustment, of 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) and unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale.

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Amount before tax, after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount, before tax, of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan.

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Amount of tax expense (benefit) allocated to other comprehensive income (loss).

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Amount of equity (deficit) attributable to parent and noncontrolling interest. Excludes temporary equity.

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