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Retirement Plans (Tables)
 6 Months Ended
Jun. 30, 2020
Pension Plans, Defined Benefit  
Schedule of Components of Net Periodic Benefit Cost

The components of total Net Periodic Benefit Cost associated with the Company’s defined benefit retirement plans are as follows (dollars in millions):

 

 

 

Three months ended June 30

 

 

Six months ended June 30

 

 

 

2020

 

 

2019

 

 

2020

 

 

2019

 

Service cost

 

$

5.2

 

 

$

4.5

 

 

$

10.5

 

 

$

9.0

 

Interest cost

 

 

4.7

 

 

 

5.2

 

 

 

9.5

 

 

 

10.3

 

Expected return on plan assets

 

 

(4.5

)

 

 

(3.9

)

 

 

(8.9

)

 

 

(7.7

)

Amortization of prior service cost

 

 

(0.4

)

 

 

0.1

 

 

 

(0.9

)

 

 

0.2

 

Amortization of actuarial loss

 

 

1.1

 

 

 

0.6

 

 

 

2.3

 

 

 

1.2

 

Net Periodic Benefit Cost

 

$

6.1

 

 

$

6.5

 

 

$

12.5

 

 

$

13.0