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Benefit Plans | 3 Months Ended
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Mar. 31, 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 March 31 were as follows:
| Pension benefits |  | Other retirement benefits |  | Total
($ in millions) | 2021 |  | 2020 |  | 2021 |  | 2020 |  | 2021 |  | 2020
Service cost | $ | 0.4 |  |  | $ | 0.3 |  |  | $ | — |  |  | $ | — |  |  | $ | 0.4 |  |  | $ | 0.3 |
Interest cost | 1.4 |  |  | 1.9 |  |  | 0.1 |  |  | 0.1 |  |  | 1.5 |  |  | 2.0 |
Expected return on assets | (3.1) |  |  | (3.0) |  |  | — |  |  | — |  |  | (3.1) |  |  | (3.0) |
Amortization of prior service credit | — |  |  | — |  |  | (0.1) |  |  | (0.2) |  |  | (0.1) |  |  | (0.2) |
Recognized actuarial losses (gains) | 0.5 |  |  | 0.5 |  |  | (0.4) |  |  | (0.4) |  |  | 0.1 |  |  | 0.1 |
Settlements | 0.6 |  |  | 1.4 |  |  | — |  |  | — |  |  | 0.6 |  |  | 1.4 |
Net periodic benefit cost | $ | (0.2) |  |  | $ | 1.1 |  |  | $ | (0.4) |  |  | $ | (0.5) |  |  | $ | (0.6) |  |  | $ | 0.6 |
| Pension benefits |  | Other retirement benefits |  | Total
($ in millions) | 2021 |  | 2020 |  | 2021 |  | 2020 |  | 2021 |  | 2020
U.S. plans | $ | (0.6) |  |  | $ | 0.8 |  |  | $ | (0.4) |  |  | $ | (0.5) |  |  | $ | (1.0) |  |  | $ | 0.3 |
International plans | 0.4 |  |  | 0.3 |  |  | — |  |  | — |  |  | 0.4 |  |  | 0.3 |
Net periodic benefit cost | $ | (0.2) |  |  | $ | 1.1 |  |  | $ | (0.4) |  |  | $ | (0.5) |  |  | $ | (0.6) |  |  | $ | 0.6 |
During the three months ended March 31, 2021 and 2020, we recorded a pension settlement charge of $0.6 million and $1.4 million, respectively, 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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