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Benefit Plans | 3 Months Ended
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Mar. 31, 2020
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) | 2020 |  | 2019 |  | 2020 |  | 2019 |  | 2020 |  | 2019
Service cost | $ | 0.3 |  |  | $ | 0.4 |  |  | $ | — |  |  | $ | — |  |  | $ | 0.3 |  |  | $ | 0.4 |
Interest cost | 1.9 |  |  | 2.4 |  |  | 0.1 |  |  | 0.1 |  |  | 2.0 |  |  | 2.5 |
Expected return on assets | (3.0) |  |  | (2.9) |  |  | — |  |  | — |  |  | (3.0) |  |  | (2.9) |
Amortization of prior service credit | — |  |  | — |  |  | (0.2) |  |  | (0.2) |  |  | (0.2) |  |  | (0.2) |
Recognized actuarial losses (gains) | 0.5 |  |  | 0.5 |  |  | (0.4) |  |  | (0.5) |  |  | 0.1 |  |  | — |
Settlements | 1.4 |  |  | — |  |  | — |  |  | — |  |  | 1.4 |  |  | — |
Net periodic benefit cost | $ | 1.1 |  |  | $ | 0.4 |  |  | $ | (0.5) |  |  | $ | (0.6) |  |  | $ | 0.6 |  |  | $ | (0.2) |
| Pension benefits |  |  |  | Other retirement benefits |  |  |  | Total |  |
($ in millions) | 2020 |  | 2019 |  | 2020 |  | 2019 |  | 2020 |  | 2019
U.S. plans | $ | 0.8 |  |  | $ | (0.1) |  |  | $ | (0.5) |  |  | $ | (0.6) |  |  | $ | 0.3 |  |  | $ | (0.7) |
International plans | 0.3 |  |  | 0.5 |  |  | — |  |  | — |  |  | 0.3 |  |  | 0.5 |
Net periodic benefit cost | $ | 1.1 |  |  | $ | 0.4 |  |  | $ | (0.5) |  |  | $ | (0.6) |  |  | $ | 0.6 |  |  | $ | (0.2) |
During the three months ended March 31, 2020, we recorded a $1.4 million pension settlement charge within other nonoperating expense (income), 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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- References No definition available. + Details
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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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