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Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Statement of Comprehensive Income [Abstract] |  |  |
Unrealized hedging gains (losses) and other, tax | $ 1.9 | $ (16.7) |
Unrealized hedging gains (losses) and other, tax |  |  | $ 2.6
Reclassification of deferred hedging (gains) losses and other, included in net income, tax | 1.7 | (3.0) |
Reclassification of deferred hedging (gains) losses and other, included in net income, tax |  |  | (3.1)
Total derivative instruments, tax | 3.6 | (19.7) |
Total derivative instruments, tax |  |  | (0.5)
Unrealized actuarial gains (losses) and prior service (costs) credits, tax | 5.2 | (1.4) | 1.3
Reclassification of net actuarial and other (gain) loss, amortization of prior service costs and settlement charges, included in net income, tax | 4.2 | 2.6 | 4.3
Total pension and other postretirement benefits, tax | $ 9.4 | $ 1.2 | $ 5.6

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- Definition Amount, after reclassification, of tax expense (benefit) for gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e640-108580 + Details
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- Definition Amount, before reclassification, of tax expense (benefit) for gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e640-108580 + Details
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- Definition Amount of tax expense (benefit) for reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e640-108580 + Details
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