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Stockholders' equity (Tables) | 6 Months Ended
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Jun. 30, 2019
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 11 for discussion of our defined benefit pension plans.
| Three months ended |  |  | Six months ended |
| June 30, |  |  | June 30, |
| 2018 |  |  | 2019 |  |  | 2018 |  |  | 2019 |
| (In millions) |
Accumulated other comprehensive loss, net of tax: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Currency translation: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (201.2 | ) |  | $ | (245.1 | ) |  | $ | (211.9 | ) |  | $ | (245.0 | )
Other comprehensive income (loss) |  | (25.2 | ) |  |  | 7.1 |  |  |  | (14.5 | ) |  |  | 7.0 |
Balance at end of period | $ | (226.4 | ) |  | $ | (238.0 | ) |  | $ | (226.4 | ) |  | $ | (238.0 | )
Defined benefit pension plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (170.4 | ) |  | $ | (177.7 | ) |  | $ | (172.8 | ) |  | $ | (180.0 | )
Other comprehensive income - amortization of prior service cost and net losses included in net periodic pension cost |  | 2.5 |  |  |  | 2.2 |  |  |  | 4.9 |  |  |  | 4.5 |
Balance at end of period | $ | (167.9 | ) |  | $ | (175.5 | ) |  | $ | (167.9 | ) |  | $ | (175.5 | )
OPEB plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | 1.1 |  |  | $ | .6 |  |  | $ | 1.2 |  |  | $ | .7 |
Other comprehensive loss - amortization of prior service credit and net losses included in net periodic OPEB cost |  | (.1 | ) |  |  | - |  |  |  | (.2 | ) |  |  | (.1 | )
Balance at end of period | $ | 1.0 |  |  | $ | .6 |  |  | $ | 1.0 |  |  | $ | .6 |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | - |  |  | $ | - |  |  | $ | 4.8 |  |  | $ | - |
Change in accounting principle |  | - |  |  |  | - |  |  |  | (4.8 | ) |  |  | - |
Balance at beginning of period, as adjusted |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Other comprehensive loss - unrealized losses arising during the period |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Balance at end of period | $ | - |  |  | $ | - |  |  | $ | - |  |  | $ | - |
Total accumulated other comprehensive loss: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (370.5 | ) |  | $ | (422.2 | ) |  | $ | (378.7 | ) |  | $ | (424.3 | )
Change in accounting principle |  | - |  |  |  | - |  |  |  | (4.8 | ) |  |  | - |
Balance at beginning of period, as adjusted |  | (370.5 | ) |  |  | (422.2 | ) |  |  | (383.5 | ) |  |  | (424.3 | )
Other comprehensive income (loss) |  | (22.8 | ) |  |  | 9.3 |  |  |  | (9.8 | ) |  |  | 11.4 |
Balance at end of period | $ | (393.3 | ) |  | $ | (412.9 | ) |  | $ | (393.3 | ) |  | $ | (412.9 | )

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: 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=114867106&loc=SL7669686-108580 + Details
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