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Pension and Other Retiree Benefits
 6 Months Ended
Jun. 30, 2021
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 six months ended June 30, 2021 and 2020 were as follows: 
Three Months Ended June 30,
PensionPost-retirement
U.S.International
(in millions)202120202021202020212020
Service cost$0.1 $0.4 $0.4 $0.3 $— $— 
Interest cost1.2 1.4 1.6 2.4 — 0.1 
Expected return on plan assets(2.8)(2.8)(5.0)(4.4)— — 
Amortization of net loss (gain)0.8 0.8 1.8 1.2 (0.1)(0.2)
Amortization of prior service cost— 0.1 — — — — 
Net periodic benefit cost (income) (1)
$(0.7)$(0.1)$(1.2)$(0.5)$(0.1)$(0.1)
Six Months Ended June 30,
PensionPost-retirement
U.S.International
(in millions)202120202021202020212020
Service cost$0.5 $0.8 $0.8 $0.7 $— $— 
Interest cost2.2 2.9 3.2 4.8 — 0.1 
Expected return on plan assets(5.6)(5.7)(9.8)(9.1)— — 
Amortization of net loss (gain)1.8 1.6 3.6 2.4 (0.2)(0.3)
Amortization of prior service cost0.1 0.2 0.1 0.1 — — 
Curtailment loss(2)
1.4 — — — — — 
Net periodic benefit cost (income) (1)
$0.4 $(0.2)$(2.1)$(1.1)$(0.2)$(0.2)

(1)The components of net periodic benefit cost (income), other than service cost, are included in the line "Non-operating pension income" in the Consolidated Statements of Income.
(2)Curtailment loss of $1.4 million due to the pension benefit freeze for the Sidney group under the ACCO Brands Corporation Pension Plan.

We expect to contribute approximately $24.5 million to our defined benefit plans in 2021. For the six months ended June 30, 2021, we have contributed $10.5 million to these plans.