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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)