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Accumulated Other Comprehensive Loss | 6 Months Ended
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Jun. 30, 2023
Equity [Abstract] |
Accumulated Other Comprehensive Loss | 8. Accumulated Other Comprehensive Loss The following table presents the changes in the accumulated balances for each component of AOCI (in millions of dollars):
|  | Quarter Ended June 30, |  |  | Six Months Ended June 30, |
|  | 2023 |  |  | 2022 |  |  | 2023 |  |  | 2022 |
Defined Benefit Plans: |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ | 3.5 |  |  | $ | (20.5 | ) |  | $ | 2.8 |  |  | $ | (21.4 | )
Actuarial (loss) gain arising during the period |  |  | (0.6 | ) |  |  | — |  |  |  | (0.6 | ) |  |  | — |
Less: income tax benefit |  |  | 0.1 |  |  |  | — |  |  |  | 0.1 |  |  |  | — |
Net actuarial (loss) gain arising during the period |  |  | (0.5 | ) |  |  | — |  |  |  | (0.5 | ) |  |  | — |
Prior service cost arising during the period |  |  | (6.6 | ) |  |  | — |  |  |  | (6.6 | ) |  |  | — |
Less: income tax benefit |  |  | 1.6 |  |  |  | — |  |  |  | 1.6 |  |  |  | — |
Net prior service cost arising during the period |  |  | (5.0 | ) |  |  | — |  |  |  | (5.0 | ) |  |  | — |
Amortization of net actuarial (gain) loss 1 |  |  | (0.3 | ) |  |  | — |  |  |  | (0.6 | ) |  |  | — |
Amortization of prior service cost 1 |  |  | 1.4 |  |  |  | 1.3 |  |  |  | 2.6 |  |  |  | 2.5 |
Less: income tax expense 2 |  |  | (0.2 | ) |  |  | (0.4 | ) |  |  | (0.4 | ) |  |  | (0.7 | )
Net amortization reclassified from AOCI to Net income (loss) |  |  | 0.9 |  |  |  | 0.9 |  |  |  | 1.6 |  |  |  | 1.8 |
Other comprehensive (loss) income, net of tax |  |  | (4.6 | ) |  |  | 0.9 |  |  |  | (3.9 | ) |  |  | 1.8 |
Ending balance |  | $ | (1.1 | ) |  | $ | (19.6 | ) |  | $ | (1.1 | ) |  | $ | (19.6 | )
Cash Flow Hedges: |  |  |  |  |  |  |  |  |  |  |  |
Beginning balance |  | $ | (1.4 | ) |  | $ | 34.8 |  |  | $ | 0.4 |  |  | $ | 17.7 |
Unrealized loss on cash flow hedges |  |  | (9.0 | ) |  |  | (50.7 | ) |  |  | (11.6 | ) |  |  | (8.4 | )
Less: income tax benefit |  |  | 2.1 |  |  |  | 12.0 |  |  |  | 2.7 |  |  |  | 2.0 |
Net unrealized loss on cash flow hedges |  |  | (6.9 | ) |  |  | (38.7 | ) |  |  | (8.9 | ) |  |  | (6.4 | )
Reclassification of unrealized loss (gain) upon settlement of cash flow hedges |  |  | 5.5 |  |  |  | 2.9 |  |  |  | 5.7 |  |  |  | (17.0 | )
Less: income tax (expense) benefit 2 |  |  | (1.3 | ) |  |  | (0.7 | ) |  |  | (1.3 | ) |  |  | 4.0 |
Net loss (gain) reclassified from AOCI to Net income (loss) |  |  | 4.2 |  |  |  | 2.2 |  |  |  | 4.4 |  |  |  | (13.0 | )
Other comprehensive loss, net of tax |  |  | (2.7 | ) |  |  | (36.5 | ) |  |  | (4.5 | ) |  |  | (19.4 | )
Ending balance 3 |  | $ | (4.1 | ) |  | $ | (1.7 | ) |  | $ | (4.1 | ) |  | $ | (1.7 | )
Total AOCI ending balance |  | $ | (5.2 | ) |  | $ | (21.3 | ) |  | $ | (5.2 | ) |  | $ | (21.3 | )
1 Amounts amortized out of AOCI related to pension and other postretirement benefits were included within Net periodic postretirement benefit cost (see Note 3). 2 Income tax amounts reclassified out of AOCI were included as a component of Income tax (provision) benefit. 3 As of June 30, 2023, we estimate a net mark-to-market loss before tax of $6.0 million in AOCI will be reclassified into Net income (loss) upon settlement within the next 12 months.

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI https://asc.fasb.org/topic&trid=2134417 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI https://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI https://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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