Stockholders' equity (Tables)

3 Months Ended

Mar. 31, 2024

Stockholders' equity

Accumulated Other Comprehensive Loss (Loss)

	Three months ended
	March 31,
	2023		2024
	(In millions)
Accumulated other comprehensive income (loss) (net of tax and   noncontrolling interest):
Marketable securities - Unrealized gain at beginning and end of period	$	1.6	$	1.7
Currency translation:
Balance at beginning of period	$	(91.5)	$	(88.8)
Other comprehensive loss arising during the period		(4.5)		(13.6)
Balance at end of period	$	(96.0)	$	(102.4)
Defined benefit pension plans:
Balance at beginning of period	$	(55.0)	$	(58.8)
Other comprehensive income:
Amortization of prior service cost and net losses   included in net periodic pension cost		.6		.5
Balance at end of period	$	(54.4)	$	(58.3)
OPEB plans:
Balance at beginning of period	$	1.0	$	.4
Other comprehensive income:
Amortization of prior service credit and net losses    included in net periodic OPEB cost		(.2)		—
Balance at end of period	$	.8	$	.4
Total accumulated other comprehensive loss:
Balance at beginning of period	$	(143.9)	$	(145.5)
Other comprehensive loss		(4.1)		(13.1)
Balance at end of period	$	(148.0)	$	(158.6)