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Stockholders' equity (Tables)
 9 Months Ended
Sep. 30, 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

 

 

Nine months ended

 

 

September 30,

 

 

September 30,

 

 

2019

 

 

2020

 

 

2019

 

 

2020

 

 

(In millions)

 

Accumulated other comprehensive loss, net of tax:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Currency translation:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Balance at beginning of period

$

(238.0

)

 

$

(270.7

)

 

$

(245.0

)

 

$

(246.8

)

Other comprehensive income (loss)

 

(18.7

)

 

 

10.1

 

 

 

(11.7

)

 

 

(13.8

)

Balance at end of period

$

(256.7

)

 

$

(260.6

)

 

$

(256.7

)

 

$

(260.6

)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Defined benefit pension plans:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Balance at beginning of period

$

(175.5

)

 

$

(196.1

)

 

$

(180.0

)

 

$

(202.2

)

Other comprehensive income - amortization

   of prior service cost and net losses included in

   net periodic pension cost

 

2.2

 

 

 

3.1

 

 

 

6.7

 

 

 

9.2

 

Balance at end of period

$

(173.3

)

 

$

(193.0

)

 

$

(173.3

)

 

$

(193.0

)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OPEB plans:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Balance at beginning of period

$

.6

 

 

$

.1

 

 

$

.7

 

 

$

.2

 

Other comprehensive loss - amortization

   of prior service credit and net losses

   included in net periodic OPEB cost

 

(.1

)

 

 

(.1

)

 

 

(.2

)

 

 

(.2

)

Balance at end of period

$

.5

 

 

$

-

 

 

$

.5

 

 

$

-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Total accumulated other comprehensive loss:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Balance at beginning of period

$

(412.9

)

 

$

(466.7

)

 

$

(424.3

)

 

$

(448.8

)

Other comprehensive income (loss)

 

(16.6

)

 

 

13.1

 

 

 

(5.2

)

 

 

(4.8

)

Balance at end of period

$

(429.5

)

 

$

(453.6

)

 

$

(429.5

)

 

$

(453.6

)