Stockholders' equity (Tables)

3 Months Ended

Mar. 31, 2020

Equity [Abstract]

Schedule of Changes in Accumulated Other Comprehensive Loss

Changes in accumulated other comprehensive loss are presented in the table below.  See Note 4 for further discussion of our marketable securities and Note 10 for discussion of our defined benefit pension plans. 

	Three months ended
	March 31,
	2019			2020
	(In millions)
Accumulated other comprehensive loss, net of tax:
Currency translation:
Balance at beginning of period	$	(245.0	)	$	(246.8	)
Other comprehensive loss		(.1	)		(41.9	)
Balance at end of period	$	(245.1	)	$	(288.7	)
Defined benefit pension plans:
Balance at beginning of period	$	(180.0	)	$	(202.2	)
Other comprehensive income - amortization    of prior service cost and net losses included in    net periodic pension cost		2.3			3.0
Balance at end of period	$	(177.7	)	$	(199.2	)
OPEB plans:
Balance at beginning of period	$	.7		$	.2
Other comprehensive loss - amortization    of prior service credit and net losses    included in net periodic OPEB cost		(.1	)		(.1	)
Balance at end of period	$	.6		$	.1
Total accumulated other comprehensive loss:
Balance at beginning of period	$	(424.3	)	$	(448.8	)
Other comprehensive income (loss)		2.1			(39.0	)
Balance at end of period	$	(422.2	)	$	(487.8	)