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Pension and Other Postemployment Benefits
 9 Months Ended
Sep. 30, 2019
Pension and Other Postemployment Benefits [Abstract]  
Pension and Other Postemployment Benefits Pension and Other Postemployment Benefits
Defined Benefit Pension Plans
The components of net periodic benefit expense were (in millions):
 
Nine Months Ended September 30,
 
2019
 
2018
Service cost
$
6.4

 
$
6.4

Interest cost
4.9

 
5.1

Expected return on plan assets
(1.1
)
 
(1.8
)
Amortization of prior service cost
0.6

 
3.3

Amortization of actuarial losses
0.9

 
4.9

 
$
11.7

 
$
17.9


We contributed $1.0 million and $1.3 million to our defined benefit pension plans in the nine months ended September 30, 2019 and 2018, respectively.
Postemployment Arrangements
The components of net periodic benefit expense were (in millions):
 
Nine Months Ended September 30,
 
2019
 
2018
Service cost
$
3.3

 
$
3.6

Interest cost
3.3

 
2.7

Amortization of prior service cost
3.3

 
2.6

Amortization of actuarial losses
0.7

 
1.3

 
$
10.6

 
$
10.2