Stockholders' equity (Tables)

12 Months Ended

Dec. 31, 2023

Stockholders' equity

Schedule of changes in accumulated other comprehensive loss

	Years ended December 31,
	2021		2022		2023
	(In millions)
Accumulated other comprehensive loss, net of tax:
Currency translation:
Balance at beginning of period	$	(233.4)	$	(240.4)	$	(269.2)
Other comprehensive income (loss)		(7.0)		(28.8)		3.7
Balance at end of period	$	(240.4)	$	(269.2)	$	(265.5)
Defined benefit pension plans:
Balance at beginning of period	$	(214.5)	$	(163.3)	$	(63.1)
Other comprehensive income:
Amortization of prior service cost and net losses   included in net periodic pension cost		14.9		9.9		2.0
Net actuarial gain (loss) arising during year		36.3		90.3		(16.0)
Plan settlement		-		-		1.1
Balance at end of period	$	(163.3)	$	(63.1)	$	(76.0)
OPEB plans:
Balance at beginning of period	$	(.3)	$	(.4)	$	.8
Other comprehensive loss - amortization    of prior service credit and net losses    included in net periodic OPEB cost		(.3)		(.3)		(.2)
Net actuarial gain (loss) arising during year		.2		1.5		(.2)
Balance at end of period	$	(.4)	$	.8	$	.4
Total accumulated other comprehensive loss:
Balance at beginning of period	$	(448.2)	$	(404.1)	$	(331.5)
Other comprehensive income (loss)		44.1		72.6		(9.6)
Balance at end of period	$	(404.1)	$	(331.5)	$	(341.1)