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v3.23.1

Accumulated Other Comprehensive Income (Tables) | 3 Months Ended
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Mar. 31, 2023
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income | The following table presents the changes in the accumulated balances for each component of AOCI (in millions of dollars):
|  | Quarter Ended March 31, |
|  | 2023 |  |  | 2022 |
Defined Benefit Plans: |  |  |  |  |  |
Beginning balance |  | $ | 2.8 |  |  | $ | (21.4 | )
Amortization of net actuarial (gain) loss 1 |  |  | (0.3 | ) |  |  | — |
Amortization of prior service cost 1 |  |  | 1.2 |  |  |  | 1.2 |
Less: income tax expense 2 |  |  | (0.2 | ) |  |  | (0.3 | )
Other comprehensive income, net of tax |  |  | 0.7 |  |  |  | 0.9 |
Ending balance |  | $ | 3.5 |  |  | $ | (20.5 | )
Cash Flow Hedges: |  |  |  |  |  |
Beginning balance |  | $ | 0.4 |  |  | $ | 17.7 |
Unrealized (loss) gain on cash flow hedges |  |  | (2.6 | ) |  |  | 42.3 |
Less: income tax benefit (expense) |  |  | 0.6 |  |  |  | (10.0 | )
Net unrealized (loss) gain on cash flow hedges |  |  | (2.0 | ) |  |  | 32.3 |
Reclassification of unrealized loss (gain) upon settlement of cash flow hedges |  |  | 0.2 |  |  |  | (19.9 | )
Less: income tax benefit 2 |  |  | — |  |  |  | 4.7 |
Net loss (gain) reclassified from AOCI to Net income |  |  | 0.2 |  |  |  | (15.2 | )
Other comprehensive (loss) income, net of tax |  |  | (1.8 | ) |  |  | 17.1 |
Ending balance 3 |  | $ | (1.4 | ) |  | $ | 34.8 |
Total AOCI ending balance |  | $ | 2.1 |  |  | $ | 14.3 |
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. 3 As of March 31, 2023, we estimate a net mark-to-market loss before tax of $3.0 million in AOCI will be reclassified into Net income upon settlement within the next 12 months.

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI https://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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