Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2022

Equity [Abstract]

Accumulated Other Comprehensive Loss

	Three months ended
	March 31,
	2021		2022
	(In millions)
Accumulated other comprehensive income (loss) (net of tax and   noncontrolling interest):
Marketable securities:
Balance at beginning of period	$	1.8	$	1.7
Other comprehensive income:
Unrealized gain arising during the period		—		—
Balance at end of period	$	1.8	$	1.7
Currency translation:
Balance at beginning of period	$	(67.4)	$	(72.2)
Other comprehensive gain arising during the period		1.3		4.2
Balance at end of period	$	(66.1)	$	(68.0)
Defined benefit pension plans:
Balance at beginning of period	$	(154.1)	$	(120.9)
Other comprehensive loss:
Amortization of prior service cost and net losses included  in net periodic pension cost		2.5		1.8
Balance at end of period	$	(151.6)	$	(119.1)
OPEB plans:
Balance at beginning of period	$	.3	$	.1
Amortization of prior service credit and net losses  included in net periodic OPEB cost		(.2)		(.1)
Balance at end of period	$	.1	$	—
Total accumulated other comprehensive loss:
Balance at beginning of period	$	(219.4)	$	(191.3)
Other comprehensive income		3.6		5.9
Balance at end of period	$	(215.8)	$	(185.4)