CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Fixed maturities available-for-sale, cost	$ 2,032.9	$ 2,521.5
Fixed maturities available-for-sale, allowance for expected credit losses	0.9	0.2
Commercial mortgage loans, cost	787.4	144.8
Equity securities, cost	396.3	11.7
Other investments, cost	577.4	311.0
Short-term investments, cost	$ 254.1	$ 429.0
Preferred shares, par value (in dollars per share)	$ 1.00	$ 1.00
Preferred shares, authorized (in shares)	10,000	30,000,000
Preferred shares, issued (in shares)	6,000	6,000
Preferred stock, liquidation preference (in dollars per share)	$ 25,000	$ 25,000
Common shares, par value (in dollars per share)	$ 0.01	$ 1.00
Common shares, shares authorized (in shares)	1,000	2,000,000,000
Common shares, shares issued (in shares)	13	1,056,638,730
Mortgage Loans
Commercial mortgage loans, cost	$ 210.1	$ 144.8
Commercial mortgage loans, allowance for expected credit losses	1.2	0.2
Private Loans
Fixed maturities available-for-sale, allowance for expected credit losses	4.4	0.0
Commercial mortgage loans, cost	577.3	0.0
Commercial mortgage loans, allowance for expected credit losses	$ 4.4	$ 0.0