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Pension And Other Retiree Benefits
 9 Months Ended
Sep. 30, 2020
Retirement Benefits [Abstract]  
Pension And Other Retiree Benefits
6. Pension and Other Retiree Benefits

The components of net periodic benefit (income) cost for pension and post-retirement plans for the three and nine months ended September 30, 2020 and 2019 were as follows: 
Three Months Ended September 30,
PensionPost-retirement
U.S.International
(in millions)202020192020201920202019
Service cost$0.4 $0.3 $0.4 $0.3 $— $— 
Interest cost1.5 1.8 2.4 3.3 — 0.1 
Expected return on plan assets(2.8)(2.9)(4.7)(5.1)— — 
Amortization of net loss (gain)0.8 0.6 1.3 0.9 (0.1)(0.1)
Amortization of prior service cost0.1 0.1 0.1 0.1 — — 
Net periodic benefit income(1)
$— $(0.1)$(0.5)$(0.5)$(0.1)$— 
Nine Months Ended September 30,
PensionPost-retirement
U.S.International
(in millions)202020192020201920202019
Service cost$1.2 $1.0 $1.1 $0.9 $— $— 
Interest cost4.4 5.5 7.2 10.1 0.1 0.2 
Expected return on plan assets(8.5)(8.7)(13.8)(15.4)— — 
Amortization of net loss (gain)2.4 1.6 3.7 2.6 (0.4)(0.3)
Amortization of prior service cost0.3 0.3 0.2 0.1 — — 
Net periodic benefit income(1)
$(0.2)$(0.3)$(1.6)$(1.7)$(0.3)$(0.1)

(1)The components, other than service cost, are included in the line "Non-operating pension income" in the Consolidated Statements of Income.

We expect to contribute approximately $19.4 million to our defined benefit plans in 2020. For the nine months ended September 30, 2020, we have contributed $13.4 million to these plans.