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Other Comprehensive Income and Accumulated Other Comprehensive Income
 9 Months Ended
Sep. 30, 2021
Equity [Abstract]  
Other Comprehensive Income and Accumulated Other Comprehensive Income
Note 6 – Other Comprehensive Income and Accumulated Other Comprehensive Income
The following information presents the Company’s Other comprehensive income (loss), both before and after-tax impacts, within the Condensed Consolidated Statements of Comprehensive Income, which also impact Accumulated other comprehensive income (“AOCI”) in the Condensed Consolidated Balance Sheets and the Condensed Consolidated Statements of Equity.
Related Tax Effects Allocated to Each Component of Other Comprehensive Income (Loss)
Three Months Ended
September 30, 2021		Three Months Ended
September 30, 2020
(Thousands of dollars)
Before-
Tax
Amount		Tax
(Expense)
or Benefit (1)		Net-of-
Tax
Amount		Before-
Tax
Amount		Tax
(Expense)
or Benefit (1)		Net-of-
Tax
Amount
Defined benefit pension plans:
Amortization of prior service cost$239 $(56)$183 $289 $(69)$220 
Amortization of net actuarial (gain)/loss11,151 (2,677)8,474 9,457 (2,270)7,187 
Regulatory adjustment(9,575)2,298 (7,277)(8,394)2,014 (6,380)
Pension plans other comprehensive income (loss)1,815 (435)1,380 1,352 (325)1,027 
FSIRS (designated hedging activities):
Amounts reclassified into net income544 (131)413 1,030 (247)783 
FSIRS other comprehensive income (loss)544 (131)413 1,030 (247)783 
Total other comprehensive income (loss) - Southwest Gas Corporation2,359 (566)1,793 2,382 (572)1,810 
Foreign currency translation adjustments:
Translation adjustments(2,056)— (2,056)1,024 — 1,024 
Foreign currency other comprehensive income (loss)(2,056)— (2,056)1,024 — 1,024 
Total other comprehensive income (loss) - Southwest Gas Holdings, Inc.$303 $(566)$(263)$3,406 $(572)$2,834 
Nine Months Ended
September 30, 2021		Nine Months Ended
September 30, 2020
(Thousands of dollars)Before-
Tax
Amount		Tax
(Expense)
or Benefit (1)		Net-of-
Tax
Amount		Before-
Tax
Amount		Tax
(Expense)
or Benefit (1)		Net-of-
Tax
Amount
Defined benefit pension plans:
Amortization of prior service cost$719 $(172)$547 $867 $(208)$659 
Amortization of net actuarial (gain)/loss33,448 (8,028)25,420 28,372 (6,809)21,563 
Regulatory adjustment(28,725)6,894 (21,831)(25,184)6,044 (19,140)
Pension plans other comprehensive income (loss)5,442 (1,306)4,136 4,055 (973)3,082 
FSIRS (designated hedging activities):
Amounts reclassified into net income1,632 (392)1,240 2,703 (649)2,054 
FSIRS other comprehensive income (loss)1,632 (392)1,240 2,703 (649)2,054 
Total other comprehensive income (loss) - Southwest Gas Corporation7,074 (1,698)5,376 6,758 (1,622)5,136 
Foreign currency translation adjustments:
Translation adjustments(324)— (324)(1,187)— (1,187)
Foreign currency other comprehensive income (loss)(324)— (324)(1,187)— (1,187)
Total other comprehensive income (loss) - Southwest Gas Holdings, Inc.$6,750 $(1,698)$5,052 $5,571 $(1,622)$3,949 
 Twelve Months Ended
September 30, 2021		Twelve Months Ended
September 30, 2020
(Thousands of dollars)
Before-
Tax
Amount		Tax
(Expense)
or Benefit (1)		Net-of-
Tax
Amount		Before-
Tax
Amount		Tax
(Expense)
or Benefit (1)		Net-of-
Tax
Amount
Defined benefit pension plans:
Net actuarial gain/(loss)$(57,539)$13,809 $(43,730)$(71,087)$17,061 $(54,026)
Amortization of prior service cost1,007 (241)766 1,185 (284)901 
Amortization of net actuarial (gain)/loss42,906 (10,298)32,608 34,216 (8,212)26,004 
Prior service cost— — — (1,878)452 (1,426)
Regulatory adjustment3,894 (935)2,959 27,803 (6,673)21,130 
Pension plans other comprehensive income (loss)(9,732)2,335 (7,397)(9,761)2,344 (7,417)
FSIRS (designated hedging activities):
Amounts reclassified into net income 2,176 (523)1,653 3,539 (850)2,689 
FSIRS other comprehensive income (loss)2,176 (523)1,653 3,539 (850)2,689 
Total other comprehensive income (loss) - Southwest Gas Corporation(7,556)1,812 (5,744)(6,222)1,494 (4,728)
Foreign currency translation adjustments:
Translation adjustments2,576 — 2,576 (280)— (280)
Foreign currency other comprehensive income (loss)2,576 — 2,576 (280)— (280)
Total other comprehensive income (loss) - Southwest Gas Holdings, Inc.$(4,980)$1,812 $(3,168)$(6,502)$1,494 $(5,008)
(1)Tax amounts are calculated using a 24% rate. The Company has elected to indefinitely reinvest, in Canada, the earnings of Centuri’s Canadian subsidiaries, thus precluding deferred taxes on such earnings. As a result of this assertion, and no repatriation of earnings anticipated, the Company is not recognizing a tax effect or presenting a tax expense or benefit for currency translation adjustments reported in Other comprehensive income (loss).
Approximately $828,000 of realized losses (net of tax) related to the remaining balance of Southwest’s previously settled forward-starting interest rate swap (“FSIRS”), included in AOCI at September 30, 2021, will be reclassified into interest expense within the next 6 months (the remainder of the amortization period for the balance) as the related interest payments on long-term debt occur.
The following table represents a rollforward of AOCI, presented on the Company’s Condensed Consolidated Balance Sheets and its Condensed Consolidated Statements of Equity:
 Defined Benefit PlansFSIRSForeign Currency Items 
(Thousands of dollars)
Before-TaxTax
(Expense)
Benefit (4)		After-TaxBefore-TaxTax
(Expense)
Benefit (4)		After-TaxBefore-TaxTax
(Expense)
Benefit		After-TaxAOCI
Beginning Balance AOCI December 31, 2020
$(77,720)$18,653 $(59,067)$(2,719)$651 $(2,068)$132 $— $132 $(61,003)
Translation adjustments— — — — — — (324)— (324)(324)
Other comprehensive income (loss) before reclassifications— — — — — — (324)— (324)(324)
FSIRS amount reclassified from AOCI (1)— — — 1,632 (392)1,240 — — — 1,240 
Amortization of prior service cost (2)719 (172)547 — — — — — — 547 
Amortization of net actuarial loss (2)33,448 (8,028)25,420 — — — — — — 25,420 
Regulatory adjustment (3)(28,725)6,894 (21,831)— — — — — — (21,831)
Net current period other comprehensive income (loss) attributable to Southwest Gas Holdings, Inc.5,442 (1,306)4,136 1,632 (392)1,240 (324)— (324)5,052 
Ending Balance AOCI September 30, 2021
$(72,278)$17,347 $(54,931)$(1,087)$259 $(828)$(192)$— $(192)$(55,951)
(1)The FSIRS reclassification amount is included in Net interest deductions on the Company’s Condensed Consolidated Statements of Income.
(2)These AOCI components are included in the computation of net periodic benefit cost (see Note 2 – Components of Net Periodic Benefit Cost for additional details).
(3)The regulatory adjustment represents the portion of the activity above that is expected to be recovered through rates in the future (the related regulatory asset is included in Deferred charges and other assets on the Company’s Condensed Consolidated Balance Sheets).
(4)Tax amounts are calculated using a 24% rate.
The following table represents a rollforward of AOCI, presented on Southwest’s Condensed Consolidated Balance Sheets:
 Defined Benefit PlansFSIRS 
(Thousands of dollars)Before-TaxTax
(Expense)
Benefit (8)		After-TaxBefore-TaxTax
(Expense)
Benefit (8)		After-TaxAOCI
Beginning Balance AOCI December 31, 2020
$(77,720)$18,653 $(59,067)$(2,719)$651 $(2,068)$(61,135)
FSIRS amount reclassified from AOCI (5)— — — 1,632 (392)1,240 1,240 
Amortization of prior service cost (6)719 (172)547 — — — 547 
Amortization of net actuarial loss (6)33,448 (8,028)25,420 — — — 25,420 
Regulatory adjustment (7)(28,725)6,894 (21,831)— — — (21,831)
Net current period other comprehensive income attributable to Southwest Gas Corporation5,442 (1,306)4,136 1,632 (392)1,240 5,376 
Ending Balance AOCI September 30, 2021
$(72,278)$17,347 $(54,931)$(1,087)$259 $(828)$(55,759)
(5)    The FSIRS reclassification amount is included in Net interest deductions on Southwest’s Condensed Consolidated Statements of Income.
(6)These AOCI components are included in the computation of net periodic benefit cost (see Note 2 – Components of Net Periodic Benefit Cost for additional details).
(7)The regulatory adjustment represents the portion of the activity above that is expected to be recovered through rates in the future (the related regulatory asset is included in Deferred charges and other assets on Southwest’s Condensed Consolidated Balance Sheets).
(8)Tax amounts are calculated using a 24% rate.
The following table represents amounts (before income tax impacts) included in AOCI (in the tables above), that have not yet been recognized in net periodic benefit cost:
(Thousands of dollars)
September 30, 2021December 31, 2020
Net actuarial loss$(469,335)$(502,783)
Prior service cost(1,768)(2,487)
Less: amount recognized in regulatory assets398,825 427,550 
Recognized in AOCI$(72,278)$(77,720)