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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Dec. 31, 2022
Fixed income securities, available for sale, amortized cost $ 4,657.4 $ 4,330.0 $ 4,131.3
Fixed income securities, available for sale, allowance for expected credit losses 2.0 2.9 7.7
Fixed income securities, trading, amortized cost 1,280.5 1,527.0 1,576.7
Short term investments available for sale, amortized cost 66.5 93.6 52.4
Short-term investments, trading, amortized cost 3.2 2.1 6.3
Catastrophe bonds, amortized cost 1.0 1.6 5.1
Privately-held investments, available for sale, amortized cost 25.1 14.7 0.0
Privately-held investments, trading at fair value, amortized cost 369.2 494.9 537.7
Unpaid losses recoverable from reinsurers, allowance for expected credit losses 11.5 3.7 3.7
Underwriting premiums receivable, allowance for expected credit losses 24.3 21.0 25.0
Fixed income securities, trading at fair value 1,281.3 1,485.7 1,475.5
Privately-held Investments, trading 341.2 475.0 533.0
Privately-held Investments, available for sale 25.3 14.9 0.0
Other investments, at fair value 204.7 209.3 221.3
Restricted cash 290.0 323.2 232.1
Accrued expenses and other payables 248.4 214.4 201.8
Asset Management Arrangement      
Accrued expenses and other payables   2.1 4.5
Related Party      
Fixed income securities, trading at fair value 120.9 129.8 0.0
Privately-held Investments, trading 75.4 112.4 44.8
Privately-held Investments, available for sale 0.0 14.9 0.0
Other investments, at fair value 38.5 39.8  
Related Party | Asset Management Arrangement      
Accrued expenses and other payables 4.0 2.1 4.5
Related Party | Management Consulting Agreement      
Accrued expenses and other payables 1.3 1.2 $ 1.3
Related Party | Dividends      
Accrued expenses and other payables $ 20.0 $ 0.0