Income taxes (Tables)

12 Months Ended

Dec. 31, 2022

Income taxes Disclosure [Abstract]

Component of Income Taxes Expenses

	Years ended December 31,
	2020		2021		2022
	(In millions)
Pre-tax income:
United States	$	45.2	$	131.4	$	81.4
Non-U.S. subsidiaries		55.4		126.4		88.5
Total	$	100.6	$	257.8	$	169.9
Expected tax expense at U.S. federal statutory income tax   rate of 21%	$	21.1	$	54.1	$	35.7
Non-U.S. tax rates		.5		4.5		2.0
Incremental net tax benefit on earnings and losses of U.S.   and non-U.S. tax group companies		(8.7)		(2.0)		(1.7)
Valuation allowance		3.8		.9		(3.0)
Global intangible low-tax income, net		2.2		2.8		1.8
Tax rate changes		(.2)		—		—
U.S. state income taxes, net		.9		1.5		1.5
Adjustment to the reserve for uncertain tax positions, net		(3.8)		(2.6)		(2.9)
Nondeductible expenses		1.0		1.1		1.0
Other, net		(.9)		(.2)		(.6)
Income tax expense	$	15.9	$	60.1	$	33.8
Components of income tax expense:
Currently payable:
U.S. federal and state	$	13.3	$	29.7	$	16.3
Non-U.S.		14.9		21.5		20.1
Total		28.2		51.2		36.4
Deferred income taxes (benefit):
U.S. federal and state		(10.3)		(1.7)		(3.9)
Non-U.S.		(2.0)		10.6		1.3
Total		(12.3)		8.9		(2.6)
Income tax expense	$	15.9	$	60.1	$	33.8
Comprehensive provision for income taxes allocable to:
Income from continuing operations	$	15.9	$	60.1	$	33.8
Discontinued operations		.6		—		—
Other comprehensive income (loss):
Currency translation		1.6		(.8)		(3.3)
Pension plans		(7.3)		29.7		60.7
Other		(.4)		—		.9
Total	$	10.4	$	89.0	$	92.1

Components of Net Deferred Tax Asset (Liability)

The components of the net deferred income taxes at December 31, 2021 and 2022 are summarized in the following table.

	December 31,
	2021				2022
	Assets		Liabilities		Assets		Liabilities
		(In millions)
Tax effect of temporary differences related to:
Inventories	$	—	$	(2.5)	$	—	$	(5.3)
Property and equipment		—		(70.4)		—		(62.8)
Lease assets (liabilities)		5.0		(5.1)		5.3		(5.4)
Accrued OPEB costs		2.8		—		2.0		—
Accrued pension costs		74.1		—		22.0		—
Accrued environmental liabilities		28.5		—		25.9		—
Other deductible differences		9.3		—		12.0		—
Other taxable differences		—		(15.5)		—		(15.8)
Investments in subsidiaries and affiliates		7.3		(52.7)		6.7		(62.3)
Tax on unremitted earnings of non-U.S. subsidiaries		—		(11.2)		—		(11.4)
Tax loss and tax credit carryforwards		89.4		—		82.6		—
Valuation allowance		(18.4)		—		(16.5)		—
Adjusted gross deferred tax assets (liabilities)		198.0		(157.4)		140.0		(163.0)
Netting of items by tax jurisdiction		(111.2)		111.2		(99.5)		99.5
Net noncurrent deferred tax asset (liability)	$	86.8	$	(46.2)	$	40.5	$	(63.5)

Changes in Uncertain Tax Positions

	Years ended December 31,
	2020		2021		2022
		(In millions)
Unrecognized tax benefits:
Amount at beginning of year	$	13.8	$	9.6	$	6.4
Net increase (decrease):
Tax positions taken in prior periods		(.3)		—		—
Tax positions taken in current period		.6		.6		.7
Lapse due to applicable statute of limitations		(4.8)		(3.6)		(3.4)
Changes in currency exchange rates		.3		(.2)		(.2)
Amount at end of year	$	9.6	$	6.4	$	3.5