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Fair Value (Tables)
 12 Months Ended
Dec. 31, 2022
Fair Value Disclosures [Abstract]  
Fair value hierarchy
The following table presents the Company’s financial assets and liabilities measured at fair value by level at December 31, 2022:
Fair Value Measurement Using:
Estimated
Fair Value		Quoted Prices in Active Markets for Identical Assets
(Level 1)		Significant Other Observable Inputs
(Level 2)		Significant Unobservable Inputs
(Level 3)
Assets measured at fair value:
Available for sale securities:
Fixed maturities:
Corporate bonds$8,020,128 $— $7,898,901 $121,227 
Mortgage backed securities795,391 — 795,391 — 
Municipal bonds419,166 — 419,166 — 
Commercial mortgage backed securities1,047,275 — 1,047,275 — 
U.S. government and government agencies5,161,193 5,144,467 16,726 — 
Non-U.S. government securities2,312,819 — 2,312,819 — 
Asset backed securities1,926,817 — 1,926,817 — 
Total19,682,789 5,144,467 14,417,095 121,227 
Short-term investments1,331,662 1,197,304 134,358 — 
Equity securities, at fair value859,969 828,513 28,042 3,414 
Derivative instruments (2)148,301 — 148,301 — 
Residential mortgage loans2,283 — 2,283 — 
Fair value option:
Corporate bonds542,755 — 542,755 — 
Non-U.S. government bonds4,315 — 4,315 — 
Asset backed securities1,652 — 1,652 — 
U.S. government and government agencies5,398 5,398 — — 
Short-term investments33,101 699 32,402 — 
Equity securities13,792 9,619 — 4,173 
Other investments196,215 — 162,956 33,259 
Other investments measured at net asset value (1)846,969 
Total1,644,197 15,716 744,080 37,432 
Total assets measured at fair value$23,669,201 $7,186,000 $15,474,159 $162,073 
Liabilities measured at fair value:
Contingent consideration liabilities$(14,246)$— $— $(14,246)
Derivative instruments (2)(75,961)— (75,961)— 
Total liabilities measured at fair value$(90,207)$— $(75,961)$(14,246)
(1)    In accordance with applicable accounting guidance, certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated balance sheets.
The following table presents the Company’s financial assets and liabilities measured at fair value by level at December 31, 2021:
Fair Value Measurement Using:
Estimated
Fair Value		Quoted Prices in Active Markets for Identical Assets
(Level 1)		Significant Other Observable Inputs
(Level 2)		Significant Unobservable Inputs
(Level 3)
Assets measured at fair value:
Available for sale securities:
Fixed maturities:
Corporate bonds$6,553,333 $— $6,553,320 $13 
Mortgage backed securities408,477 — 408,477 — 
Municipal bonds404,666 — 404,666 — 
Commercial mortgage backed securities1,046,484 — 1,046,484 — 
U.S. government and government agencies4,772,764 4,744,517 28,247 — 
Non-U.S. government securities2,120,294 — 2,120,294 — 
Asset backed securities2,692,091 — 2,688,744 3,347 
Total17,998,109 4,744,517 13,250,232 3,360 
Equity securities, at fair value1,804,170 1,762,864 38,388 2,918 
Short-term investments1,734,716 1,052,822 681,894 — 
Derivative instruments (2)127,121 — 127,121 — 
Residential mortgage loans49,847 — 49,847 — 
Fair value option:
Corporate bonds388,546 — 388,546 — 
Non-U.S. government bonds23,785 — 23,785 — 
Asset backed securities4,367 — 4,367 — 
U.S. government and government agencies— — — — 
Short-term investments97,806 528 97,278 — 
Equity securities26,493 21,745 — 4,748 
Other investments310,798 20,352 262,465 27,981 
Other investments measured at net asset value (1)1,121,755 
Total1,973,550 42,625 776,441 32,729 
Total assets measured at fair value$23,687,513 $7,602,828 $14,923,923 $39,007 
Liabilities measured at fair value:
Contingent consideration liabilities$(16,960)$— $— $(16,960)
Derivative instruments (2)(54,224)— (54,224)— 
Total liabilities measured at fair value$(71,184)$— $(54,224)$(16,960)
(1)    In accordance with applicable accounting guidance, certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated balance sheets.
Rollforward of Level 3 investments
The following table presents a reconciliation of the beginning and ending balances for all financial assets and liabilities measured at fair value on a recurring basis using Level 3 inputs for 2022 and 2021:
Assets
Liabilities
Available For Sale
Fair Value Option
Fair Value
Structured Securities (1)
Corporate Bonds
Corporate Bonds
Other Investments
Equity Securities
Equity Securities
Other
Liabilities
Year Ended December 31, 2022
Balance at beginning of year
$3,347 $13 $— $27,981 $4,748 $2,918 $(16,960)
Total gains or (losses) (realized/unrealized)
Included in earnings (2)
(592)352 — (781)(575)(470)(364)
Included in other comprehensive income(1)(1,095)— — — — 1,170 
Purchases, issuances, sales and settlements
Purchases
— 150,013 — 12,381 — 969 — 
Issuances
— — — — — — — 
Sales
(2,051)(5,363)— (3,339)— (3)— 
Settlements
(703)(26,250)— (2,983)— — 1,908 
Transfers in and/or out of Level 3
— 3,557 — — — — — 
Balance at end of year
$— $121,227 $— $33,259 $4,173 $3,414 $(14,246)
Year Ended December 31, 2021
Balance at beginning of year
$3,426 $13 $985 $67,103 $68,988 $42,015 $(461)
Total gains or (losses) (realized/unrealized)
Included in earnings (2)
(135)— 13 868 4,941 1,958 — 
Included in other comprehensive income133 — — — — — — 
Purchases, issuances, sales and settlements
Purchases
— — — 13,213 — 5,718 (16,494)
Issuances
— — — — — — — 
Sales (3)
— — (998)(53,203)(69,181)(46,773)— 
Settlements
(77)— — — — — (5)
Transfers in and/or out of Level 3
— — — — — — — 
Balance at end of year
$3,347 $13 $— $27,981 $4,748 $2,918 $(16,960)
(1)    Includes asset backed securities, mortgage backed securities and commercial mortgage backed securities.
(2)    Gains or losses were included in net realized gains (losses).
(3)     Sales for the 2021 period primarily relates to the Company’s deconsolidation of Somers.