​

​

Three months ended

​

​

March 31, 

​

  ​ ​ ​

2025

  ​ ​ ​

2026

​

​

(In millions)

Accumulated other comprehensive loss, net of tax:

​

  ​

​

  ​

Currency translation:

​

  ​

​

  ​

Balance at beginning of period

​

$

(300.0)

​

$

(267.3)

Other comprehensive income

​

17.3

​

4.2

Balance at end of period

​

$

(282.7)

​

$

(263.1)

​

​

​

​

​

​

​

Defined benefit pension plans:

​

  ​

​

  ​

Balance at beginning of period

​

$

(63.8)

​

$

(29.0)

Other comprehensive income - amortization
   of prior service cost and net losses included in
   net periodic pension cost

​

.4

​

.3

Balance at end of period

​

$

(63.4)

​

$

(28.7)

​

​

​

​

​

​

​

OPEB plans:

​

  ​

​

  ​

Balance at beginning and end of period

​

$

.3

​

$

.7

​

​

​

​

​

​

​

Total accumulated other comprehensive loss:

​

  ​

​

  ​

Balance at beginning of period

​

$

(363.5)

​

$

(295.6)

Other comprehensive income

​

17.7

​

4.5

Balance at end of period

​

$

(345.8)

​

$

(291.1)