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PENSION AND POST-RETIREMENT PLANS (Tables)
6 Months Ended
Jun. 30, 2022
PENSION AND POST-RETIREMENT PLANS  
Components of net periodic benefit cost (benefit)

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Pension Benefits

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Post-retirement Benefits

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Three Months Ended June 30, 

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Three Months Ended June 30, 

(In millions)

    

2022

    

2021

    

2022

    

2021

Components of net periodic benefit cost (benefit):

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Service cost

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$

1.2

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$

1.1

​

$

0.1

​

$

0.1

Interest cost

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1.6

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1.7

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0.2

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0.2

Expected return on plan assets

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(4.0)

​

 

(3.7)

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—

​

 

—

Amortization of net loss

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0.9

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1.2

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0.2

​

 

0.3

Amortization of prior service credit

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(0.2)

​

 

(0.5)

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(0.9)

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(0.9)

Net periodic benefit cost (benefit)

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$

(0.5)

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$

(0.2)

​

$

(0.4)

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$

(0.3)

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​

​

​

​

​

​

​

​

​

​

​

​

​

​

​

Pension Benefits

​

Post-retirement Benefits

​

​

Six Months Ended June 30, 

​

Six Months Ended June 30, 

(In millions)

    

2022

    

2021

    

2022

    

2021

Components of net periodic benefit cost (benefit):

​

​

​

​

​

​

​

​

​

​

​

​

Service cost

​

$

2.4

​

$

2.3

​

$

0.3

​

$

0.3

Interest cost

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3.3

​

 

3.2

​

 

0.4

​

 

0.4

Expected return on plan assets

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(7.9)

​

 

(7.3)

​

 

—

​

 

—

Amortization of net loss

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1.7

​

 

2.5

​

 

0.4

​

 

0.6

Amortization of prior service credit

​

 

(0.5)

​

 

(1.1)

​

 

(1.8)

​

 

(1.8)

Net periodic benefit cost (benefit)

​

$

(1.0)

​

$

(0.4)

​

$

(0.7)

​

$

(0.5)