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Benefit Plans | 6 Months Ended
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Jun. 30, 2017
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 ($ in millions):
| Pension benefits |  | Other retirement benefits |  | Total
| 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016
Service cost | $ | 2.6 |  |  | $ | 2.7 |  |  | $ | — |  |  | $ | 0.1 |  |  | $ | 2.6 |  |  | $ | 2.8 |
Interest cost | 2.4 |  |  | 2.6 |  |  | 0.1 |  |  | 0.1 |  |  | 2.5 |  |  | 2.7 |
Expected return on assets | (3.3 | ) |  | (3.2 | ) |  | — |  |  | — |  |  | (3.3 | ) |  | (3.2 | )
Amortization of prior service credit | (0.4 | ) |  | (0.3 | ) |  | (0.2 | ) |  | — |  |  | (0.6 | ) |  | (0.3 | )
Recognized actuarial losses (gains) | 1.2 |  |  | 1.1 |  |  | (0.4 | ) |  | (0.3 | ) |  | 0.8 |  |  | 0.8 |
Net periodic benefit cost | $ | 2.5 |  |  | $ | 2.9 |  |  | $ | (0.5 | ) |  | $ | (0.1 | ) |  | $ | 2.0 |  |  | $ | 2.8 |
| Pension benefits |  | Other retirement benefits |  | Total
| 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016
U.S. plans | $ | 1.8 |  |  | $ | 2.3 |  |  | $ | (0.5 | ) |  | $ | (0.1 | ) |  | $ | 1.3 |  |  | $ | 2.2 |
International plans | 0.7 |  |  | 0.6 |  |  | — |  |  | — |  |  | 0.7 |  |  | 0.6 |
Net periodic benefit cost | $ | 2.5 |  |  | $ | 2.9 |  |  | $ | (0.5 | ) |  | $ | (0.1 | ) |  | $ | 2.0 |  |  | $ | 2.8 |
The components of net periodic benefit cost for the six months ended June 30 were as follows ($ in millions):
| Pension benefits |  | Other retirement benefits |  | Total
| 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016
Service cost | $ | 5.3 |  |  | $ | 5.3 |  |  | $ | — |  |  | $ | 0.3 |  |  | $ | 5.3 |  |  | $ | 5.6 |
Interest cost | 4.9 |  |  | 5.2 |  |  | 0.2 |  |  | 0.2 |  |  | 5.1 |  |  | 5.4 |
Expected return on assets | (6.7 | ) |  | (6.3 | ) |  | — |  |  | — |  |  | (6.7 | ) |  | (6.3 | )
Amortization of prior service credit | (0.7 | ) |  | (0.7 | ) |  | (0.4 | ) |  | — |  |  | (1.1 | ) |  | (0.7 | )
Recognized actuarial losses (gains) | 2.4 |  |  | 2.3 |  |  | (1.1 | ) |  | (0.7 | ) |  | 1.3 |  |  | 1.6 |
Net periodic benefit cost | $ | 5.2 |  |  | $ | 5.8 |  |  | $ | (1.3 | ) |  | $ | (0.2 | ) |  | $ | 3.9 |  |  | $ | 5.6 |
| Pension benefits |  | Other retirement benefits |  | Total
| 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016
U.S. plans | $ | 3.8 |  |  | $ | 4.6 |  |  | $ | (1.3 | ) |  | $ | (0.2 | ) |  | $ | 2.5 |  |  | $ | 4.4 |
International plans | 1.4 |  |  | 1.2 |  |  | — |  |  | — |  |  | 1.4 |  |  | 1.2 |
Net periodic benefit cost | $ | 5.2 |  |  | $ | 5.8 |  |  | $ | (1.3 | ) |  | $ | (0.2 | ) |  | $ | 3.9 |  |  | $ | 5.6 |
During the six months ended June 30, 2017, we contributed $20.0 million to our U.S. qualified pension plan.

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