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Fair Value Measurements - Fair Value Option on Consolidated VIEs (Details) - VIE - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Mortgage loans
Fair Value Option, Quantitative Disclosures
Fair value					$ 140.6
Aggregate contractual principal					140.6
Other loans
Fair Value Option, Quantitative Disclosures
Fair value	$ 136.3		$ 136.3		129.0
Aggregate contractual principal	143.9		143.9		139.9
Change in fair value pre-tax gain (loss) - instrument specific credit risk	(2.5)	$ (5.4)	(3.8)	$ (16.8)
Change in fair value pre-tax gain (loss)	(2.5)	(5.4)	(3.8)	(16.8)
Interest income	$ 5.3	$ 6.7	$ 12.4	$ 25.1
Long-term debt
Fair Value Option, Quantitative Disclosures
Fair value					21.8
Aggregate contractual principal					$ 21.8

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The contractual principal amounts of assets for which the fair value option was elected.

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