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Stockholders' Equity (Tables)
9 Months Ended
Sep. 30, 2022
Equity [Abstract]  
Accumulated Other Comprehensive 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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2021

    

2022

    

2021

    

2022

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(In millions)

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

 

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​

  

 

​

  

 

​

  

Marketable securities:

 

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​

  

 

​

  

 

​

​

Balance at beginning of period

​

$

1.7

​

$

1.7

​

$

1.8

​

$

1.7

Other comprehensive loss:

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​

 

  

​

 

  

​

 

  

Unrealized loss arising during the period

​

 

—

​

 

(.1)

​

 

(.1)

​

 

(.1)

Balance at end of period

​

$

1.7

​

$

1.6

​

$

1.7

​

$

1.6

Currency translation:

​

 

  

​

 

  

​

 

  

​

 

  

Balance at beginning of period

​

$

(64.8)

​

$

(92.1)

​

$

(67.4)

​

$

(72.2)

Other comprehensive loss arising during the period

​

 

(5.3)

​

 

(17.2)

​

 

(2.7)

​

 

(37.1)

Balance at end of period

​

$

(70.1)

​

$

(109.3)

​

$

(70.1)

​

$

(109.3)

Defined benefit pension plans:

​

 

  

​

 

  

​

 

  

​

 

  

Balance at beginning of period

​

$

(149.1)

​

$

(117.3)

​

$

(154.1)

​

$

(120.9)

Other comprehensive income:

​

 

  

​

 

  

​

 

  

​

 

  

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

​

 

2.5

​

 

1.7

​

 

7.5

​

 

5.3

Balance at end of period

​

$

(146.6)

​

$

(115.6)

​

$

(146.6)

​

$

(115.6)

OPEB plans:

​

 

  

​

 

  

​

 

  

​

 

  

Balance at beginning of period

​

$

.1

​

$

(.1)

​

$

.3

​

$

.1

Other comprehensive loss:

​

 

  

​

 

  

​

 

  

​

 

  

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

​

 

(.1)

​

 

(.1)

​

 

(.3)

​

 

(.3)

Balance at end of period

​

$

—

​

$

(.2)

​

$

—

​

$

(.2)

Total accumulated other comprehensive loss:

​

 

  

​

 

  

​

 

  

​

 

  

Balance at beginning of period

​

$

(212.1)

​

$

(207.8)

​

$

(219.4)

​

$

(191.3)

Other comprehensive income (loss)

​

 

(2.9)

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(15.7)

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4.4

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(32.2)

Balance at end of period

​

$

(215.0)

​

$

(223.5)

​

$

(215.0)

​

$

(223.5)