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Stockholders' equity | 9 Months Ended
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Sep. 30, 2020
Equity [Abstract] |
Stockholders' equity | Note 12 - Stockholders’ equity: Changes in accumulated other comprehensive loss are presented in the table below. See Note 4 for further discussion of our marketable securities and Note 10 for discussion of our defined benefit pension plans.
| Three months ended |  |  | Nine months ended |
| September 30, |  |  | September 30, |
| 2019 |  |  | 2020 |  |  | 2019 |  |  | 2020 |
| (In millions) |
Accumulated other comprehensive loss, net of tax: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Currency translation: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (238.0 | ) |  | $ | (270.7 | ) |  | $ | (245.0 | ) |  | $ | (246.8 | )
Other comprehensive income (loss) |  | (18.7 | ) |  |  | 10.1 |  |  |  | (11.7 | ) |  |  | (13.8 | )
Balance at end of period | $ | (256.7 | ) |  | $ | (260.6 | ) |  | $ | (256.7 | ) |  | $ | (260.6 | )
Defined benefit pension plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (175.5 | ) |  | $ | (196.1 | ) |  | $ | (180.0 | ) |  | $ | (202.2 | )
Other comprehensive income - amortization of prior service cost and net losses included in net periodic pension cost |  | 2.2 |  |  |  | 3.1 |  |  |  | 6.7 |  |  |  | 9.2 |
Balance at end of period | $ | (173.3 | ) |  | $ | (193.0 | ) |  | $ | (173.3 | ) |  | $ | (193.0 | )
OPEB plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | .6 |  |  | $ | .1 |  |  | $ | .7 |  |  | $ | .2 |
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 | $ | (412.9 | ) |  | $ | (466.7 | ) |  | $ | (424.3 | ) |  | $ | (448.8 | )
Other comprehensive income (loss) |  | (16.6 | ) |  |  | 13.1 |  |  |  | (5.2 | ) |  |  | (4.8 | )
Balance at end of period | $ | (429.5 | ) |  | $ | (453.6 | ) |  | $ | (429.5 | ) |  | $ | (453.6 | )
Prior to 2019, our board of directors authorized the repurchase of up to 2.0 million shares of our common stock in open market transactions, including block purchases, or in privately-negotiated transactions at unspecified prices and over an unspecified period of time. We may repurchase our common stock from time to time as market conditions permit. The stock repurchase program does not include specific price targets or timetables and may be suspended at any time. Depending on market conditions, we may terminate the program prior to its completion. We use cash on hand or other sources of liquidity to acquire the shares. Repurchased shares are added to our treasury and subsequently cancelled upon approval of the board of directors. At December 31, 2019, 1,686,008 shares were available for repurchase under this stock repurchase program. During the first nine months of 2020, we acquired 122,489 shares of our common stock in market transactions for an aggregate purchase price of $1.0 million and subsequently cancelled all such shares. At September 30, 2020, 1,563,519 shares are available for repurchase under this stock repurchase program.

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(e)(1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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