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Benefit Plans | 3 Months Ended
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Mar. 31, 2014
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 ($ in millions):
| Pension benefits |  | Other retirement benefits |  | Total
| 2014 |  | 2013 |  | 2014 |  | 2013 |  | 2014 |  | 2013
Service cost | $ | 2.5 |  |  | $ | 2.5 |  |  | $ | 0.1 |  |  | $ | 0.4 |  |  | $ | 2.6 |  |  | $ | 2.9 |
Interest cost | 4.2 |  |  | 3.7 |  |  | 0.1 |  |  | 0.2 |  |  | 4.3 |  |  | 3.9 |
Expected return on assets | (4.8 | ) |  | (4.3 | ) |  | — |  |  | — |  |  | (4.8 | ) |  | (4.3 | )
Amortization of prior service credit | (0.3 | ) |  | (0.4 | ) |  | — |  |  | — |  |  | (0.3 | ) |  | (0.4 | )
Recognized actuarial losses (gains) | 1.2 |  |  | 2.4 |  |  | (0.4 | ) |  | — |  |  | 0.8 |  |  | 2.4 |
Net periodic benefit cost | $ | 2.8 |  |  | $ | 3.9 |  |  | $ | (0.2 | ) |  | $ | 0.6 |  |  | $ | 2.6 |  |  | $ | 4.5 |
| Pension benefits |  | Other retirement benefits |  | Total
| 2014 |  | 2013 |  | 2014 |  | 2013 |  | 2014 |  | 2013
U.S. plans | $ | 2.1 |  |  | $ | 3.1 |  |  | $ | (0.2 | ) |  | $ | 0.6 |  |  | $ | 1.9 |  |  | $ | 3.7 |
International plans | 0.7 |  |  | 0.8 |  |  | — |  |  | — |  |  | 0.7 |  |  | 0.8 |
Net periodic benefit cost | $ | 2.8 |  |  | $ | 3.9 |  |  | $ | (0.2 | ) |  | $ | 0.6 |  |  | $ | 2.6 |  |  | $ | 4.5 |

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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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