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Retirement Benefits
 9 Months Ended
Sep. 30, 2019
Retirement Benefits [Abstract]  
Retirement Benefits Retirement Benefits

The following table presents the components of net periodic pension cost and amounts recognized in other comprehensive income (loss) for our pension plans:
 
 
Three Months Ended
 
Nine Months Ended
 
 
September 30,
 
September 30,
(in millions)
 
2019
 
2018
 
2019
 
2018
Components of net periodic pension cost:
 
 
 
 
 
 
 
 
Service cost
 
$
0.6

 
$
0.3

 
$
1.5

 
$
1.1

Interest cost
 
0.5

 
0.5

 
1.5

 
1.4

Expected return on plan assets
 
(0.7
)
 
(0.5
)
 
(2.0
)
 
(1.6
)
Amortization of net actuarial losses(a)
 
0.1

 
0.2

 
0.4

 
0.5

Amortization of transitional obligation
 
—

 
(0.1
)
 
—

 
(0.1
)
Net periodic pension cost
 
$
0.5

 
$
0.4

 
$
1.4

 
$
1.3


(a)
Reflects amounts reclassified from accumulated other comprehensive income to net income.

In the nine months ended September 30, 2019, we contributed $1.1 million to our pension plans. In 2019, we expect to contribute approximately $1.6 million to our pension plans.