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CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Investments:    
Fixed income securities, available-for-sale $ 4,692,200 $ 4,122,600
Fixed income securities, trading 1,199,900 1,485,700
Short-term investments, available for sale 261,900 93,600
Short-term investments, trading at fair value 1,000 2,100
Catastrophe bonds, trading at fair value (amortized cost — 2024: $1.0 and 2023: $1.6) 1,000 1,600
Privately-held Investments, available for sale, at fair value 24,200 14,900
Privately-held Investments 286,800 475,000
Investments, equity method 7,300 7,600
Other Investments 267,200 209,300
Investments, Excluding Derivative Assets 6,741,500 6,412,400
Reinsurance recoverables:    
Cash and Cash Equivalents, at Carrying Value 914,200 1,028,100
Unpaid losses recoverable from reinsurers (net of allowance for expected credit losses of 2024: $27.5 and 2023: $3.7) 4,172,000 4,577,800
Ceded unearned premiums 901,700 733,500
Receivables:    
Underwriting premiums receivables (net of allowance for expected credit losses of 2024: $24.6 and 2023: $21.0) 1,617,000 1,435,300
Deferred acquisition costs 322,100 296,200
Derivative assets 17,000 31,700
Right-of-use operating lease assets 53,500 61,600
Income taxes refundable 900 4,300
Deferred tax assets 397,900 312,600
Other assets 590,800 309,600
Intangible assets and goodwill 19,900 21,700
Total assets 15,748,500 15,224,800
Insurance Reserve [Abstract]    
Reserve for losses and loss adjustment expenses 8,122,600 7,810,600
Unearned premiums 2,645,800 2,426,300
Total insurance reserves 10,768,400 10,236,900
Reinsurance premiums 901,100 1,416,600
Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense [Abstract]    
Income taxes payable 6,800 12,600
Deferred tax liabilities 1,100 1,600
Accrued expenses and other payables 237,200 214,400
Payables for securities purchased 36,900 22,300
Operating lease liabilities 75,600 86,100
Derivative liabilities 49,500 25,800
Short-Term Debt 300,000 300,000
Total liabilities 12,376,600 12,316,300
Commitments and contingent liabilities 0 0
Common Stock, Number of Shares, Par Value and Other Disclosure [Abstract]    
Ordinary shares, value 91 91
Preference shares, value 970,500 753,500
Additional paid-in capital 761,700 761,700
Retained earnings 2,029,700 1,793,500
Accumulated other comprehensive (loss) (390,100) (400,300)
Total shareholders' equity 3,371,900 2,908,500
Total liabilities and shareholders’ equity $ 15,748,500 $ 15,224,800