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Retirement Benefits
 6 Months Ended
Jun. 30, 2020
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 EndedSix Months Ended
June 30,June 30,
(in millions)2020201920202019
Components of net periodic pension cost:
Service cost$0.3  $0.4  $0.7  $0.9  
Interest cost0.6  0.5  1.3  1.0  
Expected return on plan assets(0.9) (0.6) (2.0) (1.3) 
Amortization of net actuarial losses(a)
0.2  0.1  0.5  0.3  
Net periodic pension cost$0.2  $0.4  $0.5  $0.9  

(a)Reflects amounts reclassified from accumulated other comprehensive income to net income.
In the six months ended June 30, 2020, we contributed $0.7 million to our pension plans. In 2020, we expect to contribute approximately $1.4 million to our pension plans.