Recent Acquisitions, Disposals & Other Transactions - Other Transactions (Details) $ / shares in Units, $ in Millions			3 Months Ended	12 Months Ended
		Jul. 01, 2024 USD ($)	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($) $ / shares shares	Sep. 25, 2024 $ / shares shares	Sep. 24, 2024 $ / shares shares	Dec. 31, 2023 $ / shares shares
Business Acquisition [Line Items]
Purchase accounting adjustments	[1]			$ 15.3
Common shares, shares authorized (in shares) | shares				1,000	1,000	2,000,000,000	2,000,000,000
Common shares, par value (in dollars per share) | $ / shares				$ 0.01	$ 0.01	$ 1.00	$ 1.00
Preferred shares, authorized (in shares) | shares				10,000	10,000	30,000,000	30,000,000
Disposal Group, Disposed of by Sale, Not Discontinued Operations | ArgoGlobal Holdings Ltd.
Business Acquisition [Line Items]
Final consideration paid		$ 86.7
AGIH Merger Sub, Inc.
Business Acquisition [Line Items]
Purchase accounting adjustments			$ 15.3
Bargain purchase gain			$ 33.6
Business acquisition, stock conversion ratio					0.000001

[1] (1) Impact of measurement period adjustment on bargain purchase in connection with the Merger. Refer to Note 2, “Recent Acquisitions, Disposals & Other Transactions” for additional information.