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Deferred Acquisition Costs (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Movement Analysis of Deferred Policy Acquisition Costs [Roll Forward]
Beginning balance	$ 10,187.6	$ 9,992.8
Costs deferred	1,056.2	1,163.9
Amortization	(1,042.4)	(1,196.9)
Ending balance	$ 10,201.4	$ 9,959.8

X

- Definition

Amount of amortization expense (reversal of expense) for deferred policy acquisition costs.

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Amount of deferred policy acquisition cost capitalized on contract remaining in force.

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