XML 52 R42.htm IDEA: XBRL DOCUMENT
v3.24.3

Stockholders' equity (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2024
Stockholders' equity |
Schedule of changes in accumulated other comprehensive income (loss) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three months ended | ​ | Nine months ended
​ | ​ | September 30, | ​ | September 30,
​ |  | 2023 |  | 2024 |  | 2023 |  | 2024
​ | ​ | (In millions)
Accumulated other comprehensive income (loss) (net of tax and noncontrolling interest): |  | ​ |  |  | ​ |  |  | ​ |  |  | ​ |
Marketable securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance at beginning of period | ​ | $ | 1.5 | ​ | $ | 1.7 | ​ | $ | 1.6 | ​ | $ | 1.7
Other comprehensive income: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unrealized gain arising during the period | ​ | ​ | .1 | ​ | ​ | .1 | ​ | ​ | — | ​ | ​ | .1
Balance at end of period | ​ | $ | 1.6 | ​ | $ | 1.8 | ​ | $ | 1.6 | ​ | $ | 1.8
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Currency translation: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Balance at beginning of period | ​ | $ | (99.6) | ​ | $ | (101.2) | ​ | $ | (91.5) | ​ | $ | (88.8)
Other comprehensive income (loss) arising during the period | ​ |  | (1.1) | ​ |  | 4.1 | ​ |  | (9.2) | ​ |  | (8.3)
Balance at end of period | ​ | $ | (100.7) | ​ | $ | (97.1) | ​ | $ | (100.7) | ​ | $ | (97.1)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Defined benefit pension plans: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Balance at beginning of period | ​ | $ | (49.8) | ​ | $ | (57.8) | ​ | $ | (55.0) | ​ | $ | (58.8)
Other comprehensive income: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Amortization of prior service cost and net losses included in net periodic pension cost | ​ |  | .5 | ​ |  | .6 | ​ |  | 1.7 | ​ |  | 1.6
Plan settlement | ​ |  | — | ​ |  | — | ​ |  | 4.0 | ​ |  | —
Balance at end of period | ​ | $ | (49.3) | ​ | $ | (57.2) | ​ | $ | (49.3) | ​ | $ | (57.2)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
OPEB plans: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Balance at beginning of period | ​ | $ | .7 | ​ | $ | .3 | ​ | $ | 1.0 | ​ | $ | .4
Other comprehensive income: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Amortization of prior service credit and net losses included in net periodic OPEB cost | ​ |  | (.1) | ​ |  | (.1) | ​ |  | (.4) | ​ |  | (.2)
Balance at end of period | ​ | $ | .6 | ​ | $ | .2 | ​ | $ | .6 | ​ | $ | .2
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total accumulated other comprehensive loss: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Balance at beginning of period | ​ | $ | (147.2) | ​ | $ | (157.0) | ​ | $ | (143.9) | ​ | $ | (145.5)
Other comprehensive income (loss) | ​ |  | (.6) | ​ |  | 4.7 | ​ |  | (3.9) | ​ |  | (6.8)
Balance at end of period | ​ | $ | (147.8) | ​ | $ | (152.3) | ​ | $ | (147.8) | ​ | $ | (152.3)

X
- References No definition available. + Details
Name: | us-gaap_EquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481674/830-30-50-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481694/830-30-45-20 + Details
Name: | us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration