Variable Interest Entities (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Limited Partnerships and Insurance-Linked Securities Funds
Variable Interest Entity [Line Items]
Fair Value	$ 159.4
DavidShield
Variable Interest Entity [Line Items]
Ownership interest (as a percent)	53.80%
PassportCard/DavidShield
Variable Interest Entity [Line Items]
Ownership interest (as a percent)	53.80%	53.80%
Other investments	$ 149.7
Elementum Holdings, L.P.
Variable Interest Entity [Line Items]
Ownership interest (as a percent)	26.60%	29.70%
Other investments	$ 30.0