Related Party Transactions (Details) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2025 USD ($) director $ / shares shares	Dec. 31, 2020 shares	Dec. 31, 2024 USD ($) shares
Related Party Transaction [Line Items]
Due from related party (less than for December 31, 2025)	$ 47.4		$ 42.4
Due from related party (less than for December 31, 2024)	$ 121.8		$ 105.7
Affiliated entity | Lemonade, Inc. | The Lemonade Foundation
Related Party Transaction [Line Items]
Shares owned by foundation (in shares) | shares	400,000		400,000
The Lemonade Foundation | Affiliated entity
Related Party Transaction [Line Items]
Contribution to the lemonade foundation (in shares) | shares	500,000	500,000
Contribution of common stock to related party, fair value (usd per share) | $ / shares	$ 24.36
Due from related party (less than for December 31, 2025)	$ 0.0		$ 0.1
Due from related party (less than for December 31, 2024)	$ 0.0		$ 0.1
Related Party
Related Party Transaction [Line Items]
Number of shared directors | director	2