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Benefit Plans | 3 Months Ended
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Mar. 31, 2018
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) | 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017
Service cost | $ | 2.8 |  |  | $ | 2.7 |  |  | $ | — |  |  | $ | — |  |  | $ | 2.8 |  |  | $ | 2.7 |
Interest cost | 2.3 |  |  | 2.5 |  |  | 0.1 |  |  | 0.1 |  |  | 2.4 |  |  | 2.6 |
Expected return on assets | (3.9 | ) |  | (3.4 | ) |  | — |  |  | — |  |  | (3.9 | ) |  | (3.4 | )
Amortization of prior service credit | (0.3 | ) |  | (0.3 | ) |  | (0.2 | ) |  | (0.2 | ) |  | (0.5 | ) |  | (0.5 | )
Recognized actuarial losses (gains) | 0.9 |  |  | 1.2 |  |  | (0.5 | ) |  | (0.7 | ) |  | 0.4 |  |  | 0.5 |
Net periodic benefit cost | $ | 1.8 |  |  | $ | 2.7 |  |  | $ | (0.6 | ) |  | $ | (0.8 | ) |  | $ | 1.2 |  |  | $ | 1.9 |
| Pension benefits |  | Other retirement benefits |  | Total
($ in millions) | 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017
U.S. plans | $ | 1.3 |  |  | $ | 2.0 |  |  | $ | (0.6 | ) |  | $ | (0.8 | ) |  | $ | 0.7 |  |  | $ | 1.2 |
International plans | 0.5 |  |  | 0.7 |  |  | — |  |  | — |  |  | 0.5 |  |  | 0.7 |
Net periodic benefit cost | $ | 1.8 |  |  | $ | 2.7 |  |  | $ | (0.6 | ) |  | $ | (0.8 | ) |  | $ | 1.2 |  |  | $ | 1.9 |
In March 2017, the FASB issued guidance on the presentation of net periodic pension and postretirement benefit cost (net benefit cost). We adopted this guidance as of January 1, 2018, on a retrospective basis. Please refer to Note 2, New Accounting Standards, for additional information. During the three months ended March 31, 2017, we contributed $20.0 million to our U.S. qualified pension plan. Effective January 1, 2019, except for interest crediting, benefit accruals under our U.S. qualified and non-qualified defined benefit pension plans will cease.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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