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FAIR VALUE MEASUREMENTS (Tables)
 12 Months Ended
Dec. 31, 2022
Fair Value Disclosures [Abstract]  
Summary of Financial Instruments Measured at Fair Value on a Recurring Basis The tables below present the financial instruments measured at fair value on a recurring basis for the periods indicated:
Quoted prices in active markets
for identical assets (Level 1)		Significant other observable
inputs (Level 2)		Significant unobservable inputs (Level 3)Fair value based on NAV practical expedientTotal fair value
At December 31, 2022
Assets
Fixed maturities, available for sale
U.S. government and agency$2,600,636 $38,694 $— $— $2,639,330 
Non-U.S. government— 562,029 — — 562,029 
Corporate debt— 4,136,452 119,104 — 4,255,556 
Agency RMBS— 1,202,785 — — 1,202,785 
CMBS— 947,778 — — 947,778 
Non-agency RMBS— 133,534 — — 133,534 
ABS— 1,429,527 — — 1,429,527 
Municipals— 156,355 — — 156,355 
 2,600,636 8,607,154 119,104 — 11,326,894 
Equity securities
Common stocks7,473 — — — 7,473 
Preferred stocks72 — — — 72 
Exchange-traded funds269,806 — — — 269,806 
Bond mutual funds— 207,902 — — 207,902 
 277,351 207,902 — — 485,253 
Other investments
Hedge funds (1)
— — — 32,616 32,616 
Direct lending funds— — — 258,626 258,626 
Private equity funds— — — 265,836 265,836 
Real estate funds— — — 298,499 298,499 
CLO-Equities— — 5,016 — 5,016 
Other privately held investments— — 136,158 — 136,158 
— — 141,174 855,577 996,751 
Short-term investments— 70,310 — — 70,310 
Other assets
Derivative instruments (refer to Note 7)— 37,682 — — 37,682 
Total Assets$2,877,987 $8,923,048 $260,278 $855,577 $12,916,890 
Liabilities
Derivative instruments (refer to Note 7)$— $703 $— $— $703 
Cash-settled awards (refer to Note 17)— 4,792 — — 4,792 
Total Liabilities$— $5,495 $— $— $5,495 
(1) Includes Long/short equity and Multi-strategy funds.
Quoted prices in active markets
for identical assets (Level 1)		Significant other observable
inputs (Level 2)		Significant unobservable inputs (Level 3)Fair value based on NAV practical expedientTotal fair value
At December 31, 2021
Assets
Fixed maturities, available for sale
U.S. government and agency$2,632,541 $49,907 $— $— $2,682,448 
Non-U.S. government— 795,178 — — 795,178 
Corporate debt— 4,452,418 42,894 — 4,495,312 
Agency RMBS— 1,074,589 — — 1,074,589 
CMBS— 1,248,191 — — 1,248,191 
Non-agency RMBS— 186,164 — — 186,164 
ABS— 1,622,480 — — 1,622,480 
Municipals— 208,838 — — 208,838 
 2,632,541 9,637,765 42,894 — 12,313,200 
Equity securities
Common stocks1,364 — — — 1,364 
Preferred stocks179 — — — 179 
Exchange-traded funds336,815 — — — 336,815 
Bond mutual funds— 317,317 — — 317,317 
 338,358 317,317 — — 655,675 
Other investments
Hedge funds (1)
— — — 59,488 59,488 
Direct lending funds— — — 289,867 289,867 
Private equity funds— — — 249,974 249,974 
Real estate funds— — — 238,222 238,222 
CLO-Equities— — 5,910 — 5,910 
Other privately held investments— — 104,521 — 104,521 
— — 110,431 837,551 947,982 
Short-term investments— 31,063 — — 31,063 
Other assets
Derivative instruments (refer to Note 7)— 3,116 — — 3,116 
Total Assets$2,970,899 $9,989,261 $153,325 $837,551 $13,951,036 
Liabilities
Derivative instruments (refer to Note 7)$— $14,987 $5,630 $— $20,617 
Cash-settled awards (refer to Note 17)— 9,091 — — 9,091 
Total Liabilities$— $24,078 $5,630 $— $29,708 
(1)    Includes Long/short equity and Multi-strategy funds.
Summary of Level 3 Fair Value Measurement Inputs
The following table quantifies the significant unobservable inputs used in estimating fair values at December 31, 2022 of investments classified as Level 3 in the fair value hierarchy:
Asset fair valueValuation techniqueUnobservable inputAmount /RangeWeighted
average
Other investments - CLO-Equities$5,016 Discounted cash flowDefault rate4.5%4.5%
  Loss severity rate50.0%50.0%
  Collateral spread3.0%3.0%
Estimated maturity date5 years5 years
Other investments - Other privately
    held investments		$17,169 Discounted cash flowDiscount rate6.6%6.6%
Default rate0.5%0.5%
Loss absorption yield1.0%1.0%
Estimated maturity date
1 - 3 years
2 years
Note: Fixed maturities of $119 million that are classified as Level 3 are excluded from the above table as these securities are priced using broker-dealer quotes. In addition, other privately held investments of $119 million that are classified as Level 3 are excluded from the above table as these investments are priced using capital statements received from investee companies.
Summary of Changes in Level 3 Financial Instruments Measured at Fair Value on a Recurring Basis, Assets
The following table presents changes in Level 3 for financial instruments measured at fair value on a recurring basis:
Opening
balance		Transfers
into
Level 3		Transfers
out of
Level 3
Included in net income(1)
Included
in OCI (2)
PurchasesSalesSettlements/
distributions		Closing
balance
Change in
unrealized
gains/(losses) (3)
Year ended December 31, 2022
Fixed maturities, available for sale         
Corporate debt$42,894 $— $— $(104)$(9,014)$90,130 $— $(4,802)$119,104 $— 
CMBS— — — — — — — — — — 
ABS— — — — — — — — — — 
 42,894 — — (104)(9,014)90,130 — (4,802)119,104 — 
Other investments
CLO-Equities5,910 — — 2,611 — — — (3,505)5,016 2,611 
Other privately held investments104,521 — — 13,646 — 19,991 — (2,000)136,158 13,646 
 110,431 — — 16,257 — 19,991 — (5,505)141,174 16,257 
Total assets$153,325 $— $— $16,153 $(9,014)$110,121 $— $(10,307)$260,278 $16,257 
Other liabilities
Derivative instruments$5,630 $— $— $(3,542)$— $— $— $(2,088)$— $— 
Total liabilities$5,630 $— $— $(3,542)$— $— $— $(2,088)$— $— 
Year ended December 31, 2021
Fixed maturities, available for sale         
Corporate debt$2,504 $— $— $— $(642)$41,800 $— $(768)$42,894 $— 
CMBS1,740 — — — 13 — — (1,753)— — 
ABS10,665 — (10,200)— 35 — — (500)— — 
 14,909 — (10,200)— (594)41,800 — (3,021)42,894 — 
Other investments
CLO-Equities6,173 — — 2,819 — — — (3,082)5,910 2,819 
Other privately held investments70,011 — — 42,653 — 21,760 (26,980)(2,923)104,521 25,273 
 76,184 — — 45,472 — 21,760 (26,980)(6,005)110,431 28,092 
Total assets$91,093 $— $(10,200)$45,472 $(594)$63,560 $(26,980)$(9,026)$153,325 $28,092 
Other liabilities
Derivative instruments$9,122 $— $— $(2,742)$— $— $— $(750)$5,630 $(1,769)
Total liabilities$9,122 $— $— $(2,742)$— $— $— $(750)$5,630 $(1,769)
(1)    Realized gains (losses) on fixed maturities and realized and unrealized gains (losses) on other assets and other liabilities included in net income are included in net investment gains (losses). Realized and unrealized gains (losses) on other investments included in net income are included in net investment income.
(2)    Unrealized gains (losses) on fixed maturities are included in other comprehensive income ("OCI").
(3)    Change in unrealized gains (losses) relating to assets and liabilities held at the reporting date.
Summary of Changes in Level 3 Financial Instruments Measured at Fair Value on a Recurring Basis, Liabilities
The following table presents changes in Level 3 for financial instruments measured at fair value on a recurring basis:
Opening
balance		Transfers
into
Level 3		Transfers
out of
Level 3
Included in net income(1)
Included
in OCI (2)
PurchasesSalesSettlements/
distributions		Closing
balance
Change in
unrealized
gains/(losses) (3)
Year ended December 31, 2022
Fixed maturities, available for sale         
Corporate debt$42,894 $— $— $(104)$(9,014)$90,130 $— $(4,802)$119,104 $— 
CMBS— — — — — — — — — — 
ABS— — — — — — — — — — 
 42,894 — — (104)(9,014)90,130 — (4,802)119,104 — 
Other investments
CLO-Equities5,910 — — 2,611 — — — (3,505)5,016 2,611 
Other privately held investments104,521 — — 13,646 — 19,991 — (2,000)136,158 13,646 
 110,431 — — 16,257 — 19,991 — (5,505)141,174 16,257 
Total assets$153,325 $— $— $16,153 $(9,014)$110,121 $— $(10,307)$260,278 $16,257 
Other liabilities
Derivative instruments$5,630 $— $— $(3,542)$— $— $— $(2,088)$— $— 
Total liabilities$5,630 $— $— $(3,542)$— $— $— $(2,088)$— $— 
Year ended December 31, 2021
Fixed maturities, available for sale         
Corporate debt$2,504 $— $— $— $(642)$41,800 $— $(768)$42,894 $— 
CMBS1,740 — — — 13 — — (1,753)— — 
ABS10,665 — (10,200)— 35 — — (500)— — 
 14,909 — (10,200)— (594)41,800 — (3,021)42,894 — 
Other investments
CLO-Equities6,173 — — 2,819 — — — (3,082)5,910 2,819 
Other privately held investments70,011 — — 42,653 — 21,760 (26,980)(2,923)104,521 25,273 
 76,184 — — 45,472 — 21,760 (26,980)(6,005)110,431 28,092 
Total assets$91,093 $— $(10,200)$45,472 $(594)$63,560 $(26,980)$(9,026)$153,325 $28,092 
Other liabilities
Derivative instruments$9,122 $— $— $(2,742)$— $— $— $(750)$5,630 $(1,769)
Total liabilities$9,122 $— $— $(2,742)$— $— $— $(750)$5,630 $(1,769)
(1)    Realized gains (losses) on fixed maturities and realized and unrealized gains (losses) on other assets and other liabilities included in net income are included in net investment gains (losses). Realized and unrealized gains (losses) on other investments included in net income are included in net investment income.
(2)    Unrealized gains (losses) on fixed maturities are included in other comprehensive income ("OCI").
(3)    Change in unrealized gains (losses) relating to assets and liabilities held at the reporting date.