Stockholders' equity (Tables)

3 Months Ended

Mar. 31, 2025

Stockholders' equity

Schedule of changes in accumulated other comprehensive income (loss)

	Three months ended
	March 31,
	2024		2025
	(In millions)
Accumulated other comprehensive income (loss) (net of tax and   noncontrolling interest):
Marketable securities:
Balance at beginning and end of period	$	1.7	$	1.7
Currency translation:
Balance at beginning of period	$	(88.8)	$	(111.7)
Other comprehensive income (loss) arising during the period		(13.6)		11.4
Balance at end of period	$	(102.4)	$	(100.3)
Defined benefit pension plans:
Balance at beginning of period	$	(58.8)	$	(49.4)
Other comprehensive income:
Amortization of prior service cost and net losses   included in net periodic pension cost		.5		.5
Balance at end of period	$	(58.3)	$	(48.9)
OPEB plans:
Balance at beginning of period	$	.4	$	.2
Other comprehensive income:
Amortization of prior service credit and net losses    included in net periodic OPEB cost		—		(.1)
Balance at end of period	$	.4	$	.1
Total accumulated other comprehensive loss:
Balance at beginning of period	$	(145.5)	$	(159.2)
Other comprehensive income (loss)		(13.1)		11.8
Balance at end of period	$	(158.6)	$	(147.4)