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Accumulated Other Comprehensive Loss (Tables) | 3 Months Ended
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Mar. 31, 2021
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) | The following table presents the changes in the accumulated balances for each component of AOCI (in millions of dollars):
|  | Quarter Ended March 31, |
|  | 2021 |  |  | 2020 |
Defined Benefit Pension Plan and Salaried VEBA: |  |  |  |  |  |  |  |
Beginning balance |  | $ | (19.8 | ) |  | $ | (33.2 | )
Amortization of net actuarial loss1 |  |  | 0.1 |  |  |  | 0.1 |
Amortization of prior service cost1 |  |  | 0.9 |  |  |  | 1.2 |
Less: income tax expense2 |  |  | (0.3 | ) |  |  | (0.3 | )
Net amortization reclassified from AOCI to Net income |  |  | 0.7 |  |  |  | 1.0 |
Translation impact on Canadian pension plan AOCI balance |  |  | — |  |  |  | 0.1 |
Other comprehensive income, net of tax |  |  | 0.7 |  |  |  | 1.1 |
Ending balance |  | $ | (19.1 | ) |  | $ | (32.1 | )
Available for Sale Securities: |  |  |  |  |  |  |  |
Beginning balance |  | $ | — |  |  | $ | 0.3 |
Unrealized gain on available for sale securities |  |  | — |  |  |  | 1.3 |
Less: income tax expense |  |  | — |  |  |  | (0.3 | )
Net unrealized gain on available for sale securities |  |  | — |  |  |  | 1.0 |
Reclassification of unrealized gain upon sale of available for sale securities3 |  |  | — |  |  |  | (1.5 | )
Less: income tax benefit2 |  |  | — |  |  |  | 0.3 |
Net gain reclassified from AOCI to Net income |  |  | — |  |  |  | (1.2 | )
Other comprehensive loss, net of tax |  |  | — |  |  |  | (0.2 | )
Ending balance |  | $ | — |  |  | $ | 0.1 |
Cash Flow Hedges: |  |  |  |  |  |  |  |
Beginning balance |  | $ | 1.1 |  |  | $ | (5.6 | )
Unrealized gain (loss) on cash flow hedges |  |  | 13.9 |  |  |  | (27.9 | )
Less: income tax (expense) benefit |  |  | (3.3 | ) |  |  | 6.8 |
Net unrealized gain (loss) on cash flow hedges |  |  | 10.6 |  |  |  | (21.1 | )
Reclassification of unrealized (gain) loss upon settlement of cash flow hedges4 |  |  | (2.7 | ) |  |  | 7.0 |
Less: income tax benefit (expense)2 |  |  | 0.6 |  |  |  | (1.8 | )
Net (gain) loss reclassified from AOCI to Net income |  |  | (2.1 | ) |  |  | 5.2 |
Other comprehensive income (loss), net of tax |  |  | 8.5 |  |  |  | (15.9 | )
Ending balance |  | $ | 9.6 |  |  | $ | (21.5 | )
Fair Value Hedges: |  |  |  |  |  |  |  |
Beginning balance |  | $ | — |  |  | $ | — |
Unrealized loss on fair value hedges |  |  | — |  |  |  | (0.8 | )
Less: income tax benefit |  |  | — |  |  |  | 0.2 |
Net unrealized loss on fair value hedges |  |  | — |  |  |  | (0.6 | )
Excluded component amortized from OCI to Net income |  |  | — |  |  |  | 0.2 |
Less: income tax expense2 |  |  | — |  |  |  | (0.1 | )
Net loss reclassified from AOCI to Net income |  |  | — |  |  |  | 0.1 |
Other comprehensive loss, net of tax |  |  | — |  |  |  | (0.5 | )
Ending balance |  | $ | — |  |  | $ | (0.5 | )
Foreign Currency Translation: |  |  |  |  |  |  |  |
Beginning balance |  | $ | — |  |  | $ | (0.1 | )
Other comprehensive loss, net of tax |  |  | (0.1 | ) |  |  | — |
Ending balance |  | $ | (0.1 | ) |  | $ | (0.1 | )
Total AOCI ending balance |  | $ | (9.6 | ) |  | $ | (54.1 | )
1 | Amounts amortized out of AOCI relating to Salaried VEBA adjustments were included within Other expense, net, as a component of Net periodic postretirement benefit cost relating to Salaried VEBA.
2 | Income tax amounts reclassified out of AOCI were included as a component of Income tax benefit (provision).
3 | Amounts reclassified out of AOCI relating to sales of available for sale securities were included as a component of Other expense, net. We use the specific identification method to determine the amount reclassified out of AOCI.
4 | As of March 31, 2021, we estimate a net mark-to-market loss before tax of $13.3 million in AOCI will be reclassified into Net income upon settlement within the next 12 months.

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