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Stockholder's Equity (Tables)
9 Months Ended
Sep. 30, 2023
Equity [Abstract]  
Accumulated Other Comprehensive Loss (Loss)

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Three months ended

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Nine months ended

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September 30, 

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September 30, 

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2022

    

2023

    

2022

    

2023

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​

(In millions)

Accumulated other comprehensive income (loss) (net of tax and
  noncontrolling interest):

 

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​

  

 

​

  

 

​

  

Marketable securities:

 

​

  

 

​

  

 

​

  

 

​

​

Balance at beginning of period

​

$

1.7

​

$

1.5

​

$

1.7

​

$

1.6

Other comprehensive income:

​

 

  

​

 

  

​

 

  

​

 

  

Unrealized gain (loss) arising during the period

​

 

(.1)

​

 

.1

​

 

(.1)

​

 

—

Balance at end of period

​

$

1.6

​

$

1.6

​

$

1.6

​

$

1.6

Currency translation:

​

 

  

​

 

  

​

 

  

​

 

  

Balance at beginning of period

​

$

(92.1)

​

$

(99.6)

​

$

(72.2)

​

$

(91.5)

Other comprehensive loss arising during the period

​

 

(17.2)

​

 

(1.1)

​

 

(37.1)

​

 

(9.2)

Balance at end of period

​

$

(109.3)

​

$

(100.7)

​

$

(109.3)

​

$

(100.7)

Defined benefit pension plans:

​

 

  

​

 

  

​

 

  

​

 

  

Balance at beginning of period

​

$

(117.3)

​

$

(49.8)

​

$

(120.9)

​

$

(55.0)

Other comprehensive income:

​

 

  

​

 

  

​

 

  

​

 

  

Amortization of prior service cost and net losses
  included in net periodic pension cost

​

 

1.7

​

 

.5

​

 

5.3

​

 

1.7

Plan settlement

​

 

—

​

 

—

​

 

—

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4.0

Balance at end of period

​

$

(115.6)

​

$

(49.3)

​

$

(115.6)

​

$

(49.3)

OPEB plans:

​

 

  

​

 

  

​

 

  

​

 

  

Balance at beginning of period

​

$

(.1)

​

$

.7

​

$

.1

​

$

1.0

Amortization of prior service credit and net losses 
  included in net periodic OPEB cost

​

 

(.1)

​

 

(.1)

​

 

(.3)

​

 

(.4)

Balance at end of period

​

$

(.2)

​

$

.6

​

$

(.2)

​

$

.6

Total accumulated other comprehensive loss:

​

 

  

​

 

  

​

 

  

​

 

  

Balance at beginning of period

​

$

(207.8)

​

$

(147.2)

​

$

(191.3)

​

$

(143.9)

Other comprehensive loss

​

 

(15.7)

​

 

(.6)

​

 

(32.2)

​

 

(3.9)

Balance at end of period

​

$

(223.5)

​

$

(147.8)

​

$

(223.5)

​

$

(147.8)