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Investment Information (Tables)
6 Months Ended
Jun. 30, 2021
Disclosure Investment Information [Abstract]  
Summary of fair value and cost or amortized cost of available for sale securities
The following table summarizes the fair value and cost or amortized cost of the Company’s securities classified as available for sale:
Estimated
Fair
Value
Gross
Unrealized
Gains
Gross
Unrealized
Losses
Allowance for Expected Credit Losses (2)Cost or
Amortized
Cost
June 30, 2021
Fixed maturities (1):
Corporate bonds$7,129,768 $217,061 $(34,751)$(1,232)$6,948,690 
Mortgage backed securities389,041 4,480 (3,479)(269)388,309 
Municipal bonds415,483 23,153 (1,660)(6)393,996 
Commercial mortgage backed securities266,733 4,017 (611)(3)263,330 
U.S. government and government agencies5,091,183 14,814 (14,013)— 5,090,382 
Non-U.S. government securities2,449,782 108,823 (18,441)(128)2,359,528 
Asset backed securities2,487,845 16,460 (4,056)(486)2,475,927 
Total18,229,835 388,808 (77,011)(2,124)17,920,162 
Short-term investments2,248,613 1,404 (1,406)— 2,248,615 
Total$20,478,448 $390,212 $(78,417)$(2,124)$20,168,777 
December 31, 2020
Fixed maturities (1):
Corporate bonds$7,856,571 $414,247 $(34,388)$(896)$7,477,608 
Mortgage backed securities630,001 8,939 (5,028)(278)626,368 
Municipal bonds494,522 27,291 (3,835)(11)471,077 
Commercial mortgage backed securities389,900 8,722 (2,954)(122)384,254 
U.S. government and government agencies5,557,077 22,612 (12,611)— 5,547,076 
Non-U.S. government securities2,433,733 153,891 (8,060)— 2,287,902 
Asset backed securities1,634,804 19,225 (10,715)(1,090)1,627,384 
Total18,996,608 654,927 (77,591)(2,397)18,421,669 
Short-term investments1,924,922 2,693 (2,063)— 1,924,292 
Total$20,921,530 $657,620 $(79,654)$(2,397)$20,345,961 
(1)    In securities lending transactions, the Company receives collateral in excess of the fair value of the fixed maturities pledged. For purposes of this table, the Company has excluded the collateral received under securities lending, at fair value and included the securities pledged under securities lending, at fair value. See “—Securities Lending Agreements.”
(2)    Effective January 1, 2020, the Company adopted ASU 2016-13 and as a result any credit impairment losses on the Company’s available-for-sale investments are recorded as an allowance, subject to reversal.
Summary of available for sale securities in a continual unrealized loss position
The following table summarizes, for all available for sale securities in an unrealized loss position, the fair value and gross unrealized loss by length of time the security has been in a continual unrealized loss position:
 Less than 12 Months12 Months or MoreTotal
Estimated
Fair
Value
Gross
Unrealized
Losses
Estimated
Fair
Value
Gross
Unrealized
Losses
Estimated
Fair
Value
Gross
Unrealized
Losses
June 30, 2021
Fixed maturities (1):
Corporate bonds$2,264,801 $(32,733)$22,895 $(2,018)$2,287,696 $(34,751)
Mortgage backed securities196,765 (2,893)13,632 (586)210,397 (3,479)
Municipal bonds24,711 (1,612)2,859 (48)27,570 (1,660)
Commercial mortgage backed securities20,039 (180)7,961 (431)28,000 (611)
U.S. government and government agencies2,920,944 (14,013)— — 2,920,944 (14,013)
Non-U.S. government securities1,282,422 (17,562)16,885 (879)1,299,307 (18,441)
Asset backed securities781,596 (2,364)93,923 (1,692)875,519 (4,056)
Total7,491,278 (71,357)158,155 (5,654)7,649,433 (77,011)
Short-term investments531,130 (1,406)— — 531,130 (1,406)
Total$8,022,408 $(72,763)$158,155 $(5,654)$8,180,563 $(78,417)
December 31, 2020
Fixed maturities (1):
Corporate bonds$747,442 $(33,086)$3,934 $(1,302)$751,376 $(34,388)
Mortgage backed securities284,619 (4,788)3,637 (240)288,256 (5,028)
Municipal bonds67,937 (3,835)— — 67,937 (3,835)
Commercial mortgage backed securities126,624 (2,916)2,655 (38)129,279 (2,954)
U.S. government and government agencies1,285,907 (12,611)— — 1,285,907 (12,611)
Non-U.S. government securities543,844 (7,658)2,441 (402)546,285 (8,060)
Asset backed securities634,470 (9,110)57,737 (1,605)692,207 (10,715)
Total3,690,843 (74,004)70,404 (3,587)3,761,247 (77,591)
Short-term investments97,920 (2,063)— — 97,920 (2,063)
Total$3,788,763 $(76,067)$70,404 $(3,587)$3,859,167 $(79,654)
(1)    In securities lending transactions, the Company receives collateral in excess of the fair value of the fixed maturities pledged. For purposes of this table, the Company has excluded the collateral received under securities lending, at fair value and included the securities pledged under securities lending, at fair value. See “—Securities Lending Agreements.”
Contractual maturities of the Company's fixed maturities and fixed maturities pledged under securities lending arrangements
The contractual maturities of the Company’s fixed maturities are shown in the following table. Expected maturities, which are management’s best estimates, will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
June 30, 2021December 31, 2020
MaturityEstimated
Fair
Value
Amortized
Cost
Estimated
Fair
Value
Amortized
Cost
Due in one year or less$452,065 $439,855 $348,200 $339,951 
Due after one year through five years10,114,276 9,942,182 10,629,959 10,340,819 
Due after five years through 10 years4,148,538 4,055,318 4,881,564 4,654,754 
Due after 10 years371,337 355,241 482,180 448,139 
 15,086,216 14,792,596 16,341,903 15,783,663 
Mortgage backed securities389,041 388,309 630,001 626,368 
Commercial mortgage backed securities266,733 263,330 389,900 384,254 
Asset backed securities2,487,845 2,475,927 1,634,804 1,627,384 
Total (1)$18,229,835 $17,920,162 $18,996,608 $18,421,669 
(1)    In securities lending transactions, the Company receives collateral in excess of the fair value of the fixed maturities pledged. For purposes of this table, the Company has excluded the collateral received under securities lending, at fair value and included the securities pledged under securities lending, at fair value. See “—Securities Lending Agreements.”
Securities lending transactions accounted for as secured borrowings, by significant investment category
The carrying value of collateral held under the Company’s securities lending transactions by significant investment category and remaining contractual maturity of the underlying agreements is as follows:
Remaining Contractual Maturity of the Agreements
Overnight and ContinuousLess than 30 Days30-90 Days90 Days or MoreTotal
June 30, 2021
U.S. government and government agencies$15,745 $137,713 $— $— $153,458 
Corporate bonds5,800 — — — 5,800 
Equity securities12,851 — — — 12,851 
Total$34,396 $137,713 $— $— $172,109 
Gross amount of recognized liabilities for securities lending in offsetting disclosure in note 9
$— 
Amounts related to securities lending not included in offsetting disclosure in note 9
$172,109 
December 31, 2020
U.S. government and government agencies$142,317 $— $139,290 $— $281,607 
Corporate bonds3,021 — — — 3,021 
Equity securities16,461 — — — 16,461 
Total$161,799 $— $139,290 $— $301,089 
Gross amount of recognized liabilities for securities lending in offsetting disclosure in note 9
$— 
Amounts related to securities lending not included in offsetting disclosure in note 9
$301,089 
Summary of assets and liabilities accounted for using the fair value option
The following table summarizes the Company’s other investments and other investable assets:
June 30,
2021
December 31,
2020
Fixed maturities$995,980 $843,354 
Other investments2,370,472 2,331,885 
Short-term investments610,114 557,008 
Equity securities94,931 92,549 
Investments accounted for using the fair value option$4,071,497 $3,824,796 
Other investable assets (1)500,000 500,000 
Total other investments$4,571,497 $4,324,796 
(1) Participation interests in a receivable of a reverse repurchase agreement.
Summary of other investments
The following table summarizes the Company’s other investments, as detailed in the previous table, by strategy:
June 30,
2021
December 31,
2020
Term loan investments$1,333,014 $1,231,731 
Lending638,786 572,636 
Credit related funds73,171 90,780 
Energy84,891 65,813 
Investment grade fixed income110,375 138,646 
Infrastructure32,109 165,516 
Private equity70,878 48,750 
Real estate27,248 18,013 
Total$2,370,472 $2,331,885 
Summary of investments accounted for using equity method
The following table summarizes the Company’s investments accounted for using the equity method, by strategy:
June 30,
2021
December 31,
2020
Credit related funds$883,279 $740,060 
Equities403,003 343,058 
Real estate323,566 258,518 
Lending295,228 179,629 
Private equity305,662 235,289 
Infrastructure210,174 175,882 
Energy118,212 115,453 
Total$2,539,124 $2,047,889 
Summary of investments in limited partnership interests where the Company has a variable interest
The following table summarizes investments in limited partnership interests where the Company has a variable interest by balance sheet line item:
June 30,
2021
December 31,
2020
Investments accounted for using the equity method (1)2,539,124 2,047,889 
Investments accounted for using the fair value option (2)182,260 184,720 
Total$2,721,384 $2,232,609 
(1)    Aggregate unfunded commitments were $2.0 billion at June 30, 2021, compared to $1.8 billion at December 31, 2020.
(2)    Aggregate unfunded commitments were $26.3 million at June 30, 2021, compared to $35.6 million at December 31, 2020.
Components of net investment income
The components of net investment income were derived from the following sources:
June 30,
 20212020
Three Months Ended
Fixed maturities$88,625 $105,391 
Term loans16,879 20,512 
Equity securities8,584 6,219 
Short-term investments1,138 3,383 
Other (1)19,950 16,460 
Gross investment income135,176 151,965 
Investment expenses(23,563)(20,480)
Net investment income$111,613 $131,485 
Six Months Ended
Fixed maturities$179,251 $220,238 
Term loans31,607 43,682 
Equity securities14,234 12,226 
Short-term investments1,745 8,279 
Other (1)34,305 35,866 
Gross investment income261,142 320,291 
Investment expenses(50,673)(43,653)
Net investment income$210,469 $276,638 
(1)    Includes income distributions from investment funds and other items.
Summary of net realized gains (losses), excluding other-than-temporary impairment provisions
Net realized gains (losses), which include changes in the allowance for credit losses on financial assets and net impairment losses recognized in earnings were as follows:
June 30,
 20212020
Three Months Ended
Available for sale securities:  
Gross gains on investment sales$115,541 $232,153 
Gross losses on investment sales(50,627)(49,824)
Change in fair value of assets and liabilities accounted for using the fair value option:
Fixed maturities10,912 68,181 
Other investments60,884 178,570 
Equity securities5,492 6,664 
Short-term investments(104)3,368 
Equity securities, at fair value:
Net realized gains (losses) on sales during the period33,570 (18,250)
Net unrealized gains (losses) on equity securities still held at reporting date65,847 145,686 
Allowance for credit losses:
Investments related896 3,225 
Underwriting related1,381 (5,834)
Derivative instruments (1)(51,109)(836)
Other 10,224 (6,515)
Net realized gains (losses)$202,907 $556,588 
Six Months Ended
Available for sale securities:
Gross gains on investment sales$180,543 $410,353 
Gross losses on investment sales(113,625)(81,792)
Change in fair value of assets and liabilities accounted for using the fair value option:
Fixed maturities27,465 (59,485)
Other investments107,739 (129,230)
Equity securities7,557 1,755 
Short-term investments632 (5,313)
Equity securities, at fair value:
Net realized gains (losses) on sales during the period71,419 (18,789)
Net unrealized gains (losses) on equity securities still held at reporting date85,555 (29,880)
Allowance for credit losses:
Investments related(752)(6,095)
Underwriting related6,649 (9,104)
Net impairments losses— (533)
Derivative instruments (1)(14,993)126,353 
Other(12,821)(8,612)
Net realized gains (losses)$345,368 $189,628 
(1)    See note 9 for information on the Company’s derivative instruments.
Rollforward of the allowance for expected credit losses of securities classified as available for sale
The following table provides a roll forward of the allowance for expected credit losses of the Company’s securities classified as available for sale:
Structured Securities (1)Municipal
Bonds
Corporate
Bonds
Short Term InvestmentsTotal
Three Months Ended June 30, 2021
Balance at beginning of period$1,207 $$2,621 $— $3,830 
Additions for current-period provision for expected credit losses52 — — 59 
Additions (reductions) for previously recognized expected credit losses (383)(412)— (791)
Reductions due to disposals(117)— (857)— (974)
Balance at end of period$759 $$1,359 $— $2,124 
Three Months Ended June 30, 2020
Balance at beginning of period$2,654 $23 $7,232 $29 $9,938 
Additions for current-period provision for expected credit losses695 44 290 (29)1,000 
Additions (reductions) for previously recognized expected credit losses (1,304)(25)(2,903)— (4,232)
Reductions due to disposals(319)(14)(504)— (837)
Balance at end of period$1,726 $28 $4,115 $— $5,869 
Six Months Ended June 30, 2021
Balance at beginning of period$1,490 $11 $896 $— $2,397 
Additions for current-period provision for expected credit losses234 — 2,428 — 2,662 
Additions (reductions) for previously recognized expected credit losses (765)(5)(952)— (1,722)
Reductions due to disposals(200)— (1,013)— (1,213)
Balance at end of period$759 $$1,359 $— $2,124 
Six Months Ended June 30, 2020
Balance at beginning of period$— $— $— $— $— 
Cumulative effect of accounting change (2)517 — 117 — 634 
Additions for current-period provision for expected credit losses2,841 67 7,441 — 10,349 
Additions (reductions) for previously recognized expected credit losses(1,306)(25)(2,924)— (4,255)
Reductions due to disposals(326)(14)(519)— (859)
Balance at end of period$1,726 $28 $4,115 $— $5,869 
(1)    Includes asset backed securities, mortgage backed securities and commercial mortgage backed securities.
(2)    Adoption of ASU 2016-13, “Financial Instruments - Credit Losses (Topic 326)”.
Summary of restricted assets
The following table details the value of the Company’s restricted assets:
June 30,
2021
December 31,
2020
Assets used for collateral or guarantees:  
Affiliated transactions$5,041,190 $4,643,334 
Third party agreements3,441,929 3,083,324 
Deposits with U.S. regulatory authorities814,084 827,552 
Deposits with non-U.S. regulatory authorities428,132 179,099 
Total restricted assets$9,725,335 $8,733,309 
Reconciliation of cash and restricted cash
The following table details reconciliation of cash and restricted cash within the Consolidated Balance Sheets:
June 30,
2021
December 31,
2020
Cash$1,234,059 $906,448 
Restricted cash (included in ‘other assets’)$584,404 $384,096 
Cash and restricted cash$1,818,463 $1,290,544