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Employee Benefit Plans and Other Postretirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2018
Compensation And Retirement Disclosure [Abstract]  
Components of Net Periodic Benefit Costs

The components of net periodic benefit cost for our pension plans were as follows (dollars in millions):

 

 

 

Pension Plans

 

 

 

Three Months Ended September 30,

 

 

Nine Months Ended September 30,

 

 

 

2018

 

 

2017

 

 

2018

 

 

2017

 

Service cost

 

$

6.3

 

 

$

5.8

 

 

$

18.8

 

 

$

18.0

 

Interest cost

 

 

10.6

 

 

 

10.4

 

 

 

31.8

 

 

 

31.1

 

Expected return on plan assets

 

 

(14.2

)

 

 

(13.5

)

 

 

(42.5

)

 

 

(40.5

)

Net amortization of unrecognized amounts

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Prior service cost

 

 

1.8

 

 

 

1.4

 

 

 

5.2

 

 

 

4.4

 

Actuarial loss

 

 

2.3

 

 

 

1.9

 

 

 

7.0

 

 

 

5.7

 

Net periodic benefit cost

 

$

6.8

 

 

$

6.0

 

 

$

20.3

 

 

$

18.7

 

The components of net periodic benefit cost for our postretirement plans were as follows (dollars in millions):

 

 

 

Postretirement Plans

 

 

 

Three Months Ended September 30,

 

 

Nine Months Ended September 30,

 

 

 

2018

 

 

2017

 

 

2018

 

 

2017

 

Service cost

 

$

0.1

 

 

$

0.1

 

 

$

0.2

 

 

$

0.2

 

Interest cost

 

 

0.1

 

 

 

0.2

 

 

 

0.4

 

 

 

0.5

 

Net amortization of unrecognized amounts

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Prior service cost

 

 

(0.1

)

 

 

(0.1

)

 

 

(0.2

)

 

 

(0.1

)

Actuarial income

 

 

—

 

 

 

(0.1

)

 

 

(0.1

)

 

 

(0.1

)

Net periodic benefit cost

 

$

0.1

 

 

$

0.1

 

 

$

0.3

 

 

$

0.5