Derivative Financial Instruments - Fair Value and Notional Amounts of Derivative Instruments (Details) - Not Designated as Hedging Instrument - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Notional amounts
Total derivative assets	$ 172.6	$ 0.0
Total derivative liabilities	0.1	31.0
Fair value
Fair value	0.2	0.0
Fair value	0.1	(0.5)
Forwards
Notional amounts
Total derivative assets	172.6	0.0
Total derivative liabilities	0.0	31.0
Fair value
Fair value	0.2	0.0
Fair value	0.0	(0.5)
Credit default swaps
Notional amounts
Total derivative liabilities	0.1	0.0
Fair value
Fair value	$ 0.1	$ 0.0

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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