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Accumulated Other Comprehensive Loss | 9 Months Ended
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Sep. 30, 2021
Equity [Abstract] |
Accumulated Other Comprehensive Loss | Note 11 – Accumulated other comprehensive loss: Changes in accumulated other comprehensive loss are presented in the table below. See Note 4 for further discussion of our marketable securities and Note 9 for discussion of our defined benefit pension plans.
| Three months ended |  |  | Nine months ended |
| September 30, |  |  | September 30, |
| 2020 |  |  | 2021 |  |  | 2020 |  |  | 2021 |
| (In millions) |
Accumulated other comprehensive loss, net of tax: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Currency translation: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (270.7 | ) |  | $ | (229.4 | ) |  | $ | (246.8 | ) |  | $ | (233.4 | )
Other comprehensive income (loss) |  | 10.1 |  |  |  | (7.8 | ) |  |  | (13.8 | ) |  |  | (3.8 | )
Balance at end of period | $ | (260.6 | ) |  | $ | (237.2 | ) |  | $ | (260.6 | ) |  | $ | (237.2 | )
Defined benefit pension plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (196.1 | ) |  | $ | (207.5 | ) |  | $ | (202.2 | ) |  | $ | (214.5 | )
Other comprehensive income - amortization of prior service cost and net losses included in net periodic pension cost |  | 3.1 |  |  |  | 3.5 |  |  |  | 9.2 |  |  |  | 10.5 |
Balance at end of period | $ | (193.0 | ) |  | $ | (204.0 | ) |  | $ | (193.0 | ) |  | $ | (204.0 | )
OPEB plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | .1 |  |  | $ | (.4 | ) |  | $ | .2 |  |  | $ | (.3 | )
Other comprehensive loss - amortization of prior service credit and net losses included in net periodic OPEB cost |  | (.1 | ) |  |  | (.1 | ) |  |  | (.2 | ) |  |  | (.2 | )
Balance at end of period | $ | - |  |  | $ | (.5 | ) |  | $ | - |  |  | $ | (.5 | )
Total accumulated other comprehensive loss: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (466.7 | ) |  | $ | (437.3 | ) |  | $ | (448.8 | ) |  | $ | (448.2 | )
Other comprehensive income (loss) |  | 13.1 |  |  |  | (4.4 | ) |  |  | (4.8 | ) |  |  | 6.5 |
Balance at end of period | $ | (453.6 | ) |  | $ | (441.7 | ) |  | $ | (453.6 | ) |  | $ | (441.7 | )

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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 http://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 http://asc.fasb.org/extlink&oid=123367319&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 http://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 http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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