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Accumulated Other Comprehensive Loss (Tables) | 3 Months Ended
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Mar. 31, 2021
Other Comprehensive Income (Loss), Tax [Abstract] |
Components Of Accumulated Other Comprehensive Loss | The following tables display the components of Accumulated Other Comprehensive Loss:
(in millions) | Gains and Losses on Securities(1) |  | Gains and Losses on Cash Flow Hedges(1) |  | Pension and OPEB Items(1) |  | Accumulated Other Comprehensive Loss(1)
Balance as of January 1, 2021 | $ | 6.0 |  |  | $ | (147.9) |  |  | $ | (14.8) |  |  | $ | (156.7) |
Other comprehensive income (loss) before reclassifications | (2.2) |  |  | 84.6 |  |  | (1.4) |  |  | 81.0 |
Amounts reclassified from accumulated other comprehensive income (loss) | (0.3) |  |  | — |  |  | 0.5 |  |  | 0.2 |
Net current-period other comprehensive income (loss) | (2.5) |  |  | 84.6 |  |  | (0.9) |  |  | 81.2 |
Balance as of March 31, 2021 | $ | 3.5 |  |  | $ | (63.3) |  |  | $ | (15.7) |  |  | $ | (75.5) |
(1)All amounts are net of tax. Amounts in parentheses indicate debits. |  |  |  |  |  |  |
(in millions) | Gains and Losses on Securities(1) |  | Gains and Losses on Cash Flow Hedges(1) |  | Pension and OPEB Items(1) |  | Accumulated Other Comprehensive Loss(1)
Balance as of January 1, 2020 | $ | 3.3 |  |  | $ | (77.2) |  |  | $ | (18.7) |  |  | $ | (92.6) |
Other comprehensive income (loss) before reclassifications | (5.2) |  |  | (133.3) |  |  | 0.4 |  |  | (138.1) |
Amounts reclassified from accumulated other comprehensive income (loss) | (0.2) |  |  | — |  |  | 0.3 |  |  | 0.1 |
Net current-period other comprehensive income (loss) | (5.4) |  |  | (133.3) |  |  | 0.7 |  |  | (138.0) |
Balance as of March 31, 2020 | $ | (2.1) |  |  | $ | (210.5) |  |  | $ | (18.0) |  |  | $ | (230.6) |
(1)All amounts are net of tax. Amounts in parentheses indicate debits. |  |  |  |  |  |  |

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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 http://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 http://asc.fasb.org/extlink&oid=121641772&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 http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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