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v3.20.2

Stockholders' equity (Tables) | 9 Months Ended
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Sep. 30, 2020
Equity [Abstract] |
Schedule of Changes in 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 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 | )

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