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Benefit Plans | 6 Months Ended
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Jun. 30, 2019
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 June 30 were as follows:
| Pension benefits |  | Other retirement benefits |  | Total
($ in millions) | 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018
Service cost | $ | 0.3 |  |  | $ | 2.7 |  |  | $ | — |  |  | $ | — |  |  | $ | 0.3 |  |  | $ | 2.7 |
Interest cost | 2.5 |  |  | 2.4 |  |  | — |  |  | — |  |  | 2.5 |  |  | 2.4 |
Expected return on assets | (2.9 | ) |  | (3.9 | ) |  | — |  |  | — |  |  | (2.9 | ) |  | (3.9 | )
Amortization of prior service credit | — |  |  | (0.5 | ) |  | (0.1 | ) |  | (0.1 | ) |  | (0.1 | ) |  | (0.6 | )
Recognized actuarial losses (gains) | 0.6 |  |  | 1.0 |  |  | (0.6 | ) |  | (0.6 | ) |  | — |  |  | 0.4 |
Net periodic benefit cost | $ | 0.5 |  |  | $ | 1.7 |  |  | $ | (0.7 | ) |  | $ | (0.7 | ) |  | $ | (0.2 | ) |  | $ | 1.0 |
| Pension benefits |  | Other retirement benefits |  | Total
($ in millions) | 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018
U.S. plans | $ | — |  |  | $ | 1.2 |  |  | $ | (0.7 | ) |  | $ | (0.7 | ) |  | $ | (0.7 | ) |  | $ | 0.5 |
International plans | 0.5 |  |  | 0.5 |  |  | — |  |  | — |  |  | 0.5 |  |  | 0.5 |
Net periodic benefit cost | $ | 0.5 |  |  | $ | 1.7 |  |  | $ | (0.7 | ) |  | $ | (0.7 | ) |  | $ | (0.2 | ) |  | $ | 1.0 |
The components of net periodic benefit cost for the six months ended June 30 were as follows:
| Pension benefits |  | Other retirement benefits |  | Total
($ in millions) | 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018
Service cost | $ | 0.7 |  |  | $ | 5.5 |  |  | $ | — |  |  | $ | — |  |  | $ | 0.7 |  |  | $ | 5.5 |
Interest cost | 4.9 |  |  | 4.7 |  |  | 0.1 |  |  | 0.1 |  |  | 5.0 |  |  | 4.8 |
Expected return on assets | (5.8 | ) |  | (7.8 | ) |  | — |  |  | — |  |  | (5.8 | ) |  | (7.8 | )
Amortization of prior service credit | — |  |  | (0.8 | ) |  | (0.3 | ) |  | (0.3 | ) |  | (0.3 | ) |  | (1.1 | )
Recognized actuarial losses (gains) | 1.1 |  |  | 1.9 |  |  | (1.1 | ) |  | (1.1 | ) |  | — |  |  | 0.8 |
Net periodic benefit cost | $ | 0.9 |  |  | $ | 3.5 |  |  | $ | (1.3 | ) |  | $ | (1.3 | ) |  | $ | (0.4 | ) |  | $ | 2.2 |
| Pension benefits |  | Other retirement benefits |  | Total
($ in millions) | 2019 |  | 2018 |  | 2019 |  | 2018 |  | 2019 |  | 2018
U.S. plans | $ | (0.1 | ) |  | $ | 2.5 |  |  | $ | (1.3 | ) |  | $ | (1.3 | ) |  | $ | (1.4 | ) |  | $ | 1.2 |
International plans | 1.0 |  |  | 1.0 |  |  | — |  |  | — |  |  | 1.0 |  |  | 1.0 |
Net periodic benefit cost | $ | 0.9 |  |  | $ | 3.5 |  |  | $ | (1.3 | ) |  | $ | (1.3 | ) |  | $ | (0.4 | ) |  | $ | 2.2 |
Effective January 1, 2019, except for interest crediting, benefit accruals under our U.S. qualified and non-qualified defined benefit pension plans ceased.

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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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