​

​

Pension Benefits

​

Post-retirement Benefits

​

​

Three Months Ended June 30, 

​

Three Months Ended June 30, 

(In millions)

  ​ ​ ​

2026

  ​ ​ ​

2025

  ​ ​ ​

2026

  ​ ​ ​

2025

Components of net periodic benefit cost (credit):

​

​

​

​

​

​

​

​

​

​

​

​

Service cost

​

$

1.3

​

$

1.1

​

$

—

​

$

0.1

Interest cost

​

2.5

​

2.6

​

0.3

​

0.2

Expected return on plan assets

​

(3.8)

​

(4.4)

​

—

​

—

Amortization of net actuarial loss (gain)

​

—

​

—

​

(0.1)

​

(0.1)

Amortization of prior service credit

​

—

​

—

​

(0.6)

​

(1.0)

Net periodic benefit credit

​

$

—

​

$

(0.7)

​

$

(0.4)

​

$

(0.8)

​

​

Pension Benefits

​

Post-retirement Benefits

​

​

Six Months Ended June 30, 

​

Six Months Ended June 30, 

(In millions)

  ​ ​ ​

2026

  ​ ​ ​

2025

  ​ ​ ​

2026

  ​ ​ ​

2025

Components of net periodic benefit cost (credit):

​

​

​

​

​

​

​

​

​

​

​

​

Service cost

​

$

2.5

​

$

2.2

​

$

0.1

​

$

0.1

Interest cost

​

5.1

​

5.2

​

0.5

​

0.5

Expected return on plan assets

​

(8.2)

​

(8.8)

​

—

​

—

Amortization of net actuarial loss (gain)

​

—

​

—

​

(0.3)

​

(0.3)

Amortization of prior service credit

​

—

​

—

​

(1.1)

​

(1.9)

Net periodic benefit credit

​

$

(0.6)

​

$

(1.4)

​

$

(0.8)

​

$

(1.6)