Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Cash provided by (used in) operating activities excluding reduction in collateral funds	$ 1.4	$ (203.3)	$ 118.7
Excess and Surplus Lines | E&S ADC
Payments for reinsurance		313.2
Excess and Surplus Lines | E&S Top Up ADC
Payments for reinsurance		$ 52.8