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Benefit Plans | 9 Months Ended
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Sep. 30, 2021
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |
Benefit Plans | Benefit Plans The components of net periodic benefit cost for the three months ended September 30 were as follows:
| Pension benefits |  | Other retirement benefits |  | Total
($ in millions) | 2021 |  | 2020 |  | 2021 |  | 2020 |  | 2021 |  | 2020
Service cost | $ | 0.1 |  |  | $ | 0.4 |  |  | $ | — |  |  | $ | — |  |  | $ | 0.1 |  |  | $ | 0.4 |
Interest cost | 1.6 |  |  | 1.7 |  |  | — |  |  | — |  |  | 1.6 |  |  | 1.7 |
Expected return on assets | (2.9) |  |  | (2.8) |  |  | — |  |  | — |  |  | (2.9) |  |  | (2.8) |
Amortization of prior service credit | — |  |  | 0.1 |  |  | (0.1) |  |  | (0.2) |  |  | (0.1) |  |  | (0.1) |
Recognized actuarial losses (gains) | 0.5 |  |  | 0.4 |  |  | (0.3) |  |  | (0.6) |  |  | 0.2 |  |  | (0.2) |
Settlements | — |  |  | 1.1 |  |  | — |  |  | — |  |  | — |  |  | 1.1 |
Net periodic benefit cost | $ | (0.7) |  |  | $ | 0.9 |  |  | $ | (0.4) |  |  | $ | (0.8) |  |  | $ | (1.1) |  |  | $ | 0.1 |
| Pension benefits |  | Other retirement benefits |  | Total
($ in millions) | 2021 |  | 2020 |  | 2021 |  | 2020 |  | 2021 |  | 2020
U.S. plans | $ | (0.9) |  |  | $ | 0.5 |  |  | $ | (0.4) |  |  | $ | (0.8) |  |  | $ | (1.3) |  |  | $ | (0.3) |
International plans | 0.2 |  |  | 0.4 |  |  | — |  |  | — |  |  | 0.2 |  |  | 0.4 |
Net periodic benefit cost | $ | (0.7) |  |  | $ | 0.9 |  |  | $ | (0.4) |  |  | $ | (0.8) |  |  | $ | (1.1) |  |  | $ | 0.1 |
The components of net periodic benefit cost for the nine months ended September 30 were as follows:
| Pension benefits |  | Other retirement benefits |  | Total
($ in millions) | 2021 |  | 2020 |  | 2021 |  | 2020 |  | 2021 |  | 2020
Service cost | $ | 0.9 |  |  | $ | 1.0 |  |  | $ | — |  |  | $ | — |  |  | $ | 0.9 |  |  | $ | 1.0 |
Interest cost | 4.5 |  |  | 5.5 |  |  | 0.1 |  |  | 0.1 |  |  | 4.6 |  |  | 5.6 |
Expected return on assets | (9.0) |  |  | (8.8) |  |  | — |  |  | — |  |  | (9.0) |  |  | (8.8) |
Amortization of prior service credit | 0.1 |  |  | 0.1 |  |  | (0.3) |  |  | (0.5) |  |  | (0.2) |  |  | (0.4) |
Recognized actuarial losses (gains) | 1.5 |  |  | 1.4 |  |  | (1.2) |  |  | (1.4) |  |  | 0.3 |  |  | — |
Settlements | 0.7 |  |  | 3.4 |  |  | — |  |  | — |  |  | 0.7 |  |  | 3.4 |
Net periodic benefit cost | $ | (1.3) |  |  | $ | 2.6 |  |  | $ | (1.4) |  |  | $ | (1.8) |  |  | $ | (2.7) |  |  | $ | 0.8 |
| Pension benefits |  | Other retirement benefits |  | Total
($ in millions) | 2021 |  | 2020 |  | 2021 |  | 2020 |  | 2021 |  | 2020
U.S. plans | $ | (2.4) |  |  | $ | 1.5 |  |  | $ | (1.4) |  |  | $ | (1.8) |  |  | $ | (3.8) |  |  | $ | (0.3) |
International plans | 1.1 |  |  | 1.1 |  |  | — |  |  | — |  |  | 1.1 |  |  | 1.1 |
Net periodic benefit cost | $ | (1.3) |  |  | $ | 2.6 |  |  | $ | (1.4) |  |  | $ | (1.8) |  |  | $ | (2.7) |  |  | $ | 0.8 |
During the nine months ended September 30, 2021, we recorded a $0.7 million pension settlement charge within other nonoperating (income) expense, as we determined that normal-course lump-sum payments for our U.S. qualified defined benefit pension plan exceeded the threshold for settlement accounting under U.S. GAAP for the year.

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