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Benefit Plans | 9 Months Ended
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Sep. 30, 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 September 30 were as follows ($ in millions):
| Pension benefits |  | Other retirement benefits |  | Total
| 2014 |  | 2013 |  | 2014 |  | 2013 |  | 2014 |  | 2013
Service cost | $ | 2.3 |  |  | $ | 2.3 |  |  | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | 2.4 |  |  | $ | 2.4 |
Interest cost | 4.2 |  |  | 3.6 |  |  | 0.1 |  |  | — |  |  | 4.3 |  |  | 3.6 |
Expected return on assets | (4.7 | ) |  | (4.3 | ) |  | — |  |  | — |  |  | (4.7 | ) |  | (4.3 | )
Amortization of prior service credit | (0.3 | ) |  | (0.3 | ) |  | — |  |  | — |  |  | (0.3 | ) |  | (0.3 | )
Recognized actuarial losses (gains) | 1.3 |  |  | 2.2 |  |  | (0.5 | ) |  | (0.5 | ) |  | 0.8 |  |  | 1.7 |
Net periodic benefit cost | $ | 2.8 |  |  | $ | 3.5 |  |  | $ | (0.3 | ) |  | $ | (0.4 | ) |  | $ | 2.5 |  |  | $ | 3.1 |
| Pension benefits |  | Other retirement benefits |  | Total
| 2014 |  | 2013 |  | 2014 |  | 2013 |  | 2014 |  | 2013
U.S. plans | $ | 2.0 |  |  | $ | 2.7 |  |  | $ | (0.3 | ) |  | $ | (0.4 | ) |  | $ | 1.7 |  |  | $ | 2.3 |
International plans | 0.8 |  |  | 0.8 |  |  | — |  |  | — |  |  | 0.8 |  |  | 0.8 |
Net periodic benefit cost | $ | 2.8 |  |  | $ | 3.5 |  |  | $ | (0.3 | ) |  | $ | (0.4 | ) |  | $ | 2.5 |  |  | $ | 3.1 |
The components of net periodic benefit cost for the nine months ended September 30 were as follows ($ in millions):
| Pension benefits |  | Other retirement benefits |  | Total
| 2014 |  | 2013 |  | 2014 |  | 2013 |  | 2014 |  | 2013
Service cost | $ | 7.4 |  |  | $ | 7.3 |  |  | $ | 0.3 |  |  | $ | 0.8 |  |  | $ | 7.7 |  |  | $ | 8.1 |
Interest cost | 12.7 |  |  | 11.0 |  |  | 0.3 |  |  | 0.5 |  |  | 13.0 |  |  | 11.5 |
Expected return on assets | (14.4 | ) |  | (12.9 | ) |  | — |  |  | — |  |  | (14.4 | ) |  | (12.9 | )
Amortization of transition obligation | 0.1 |  |  | 0.1 |  |  | — |  |  | — |  |  | 0.1 |  |  | 0.1 |
Amortization of prior service credit | (1.0 | ) |  | (1.0 | ) |  | — |  |  | — |  |  | (1.0 | ) |  | (1.0 | )
Recognized actuarial losses (gains) | 3.6 |  |  | 6.9 |  |  | (1.2 | ) |  | (0.5 | ) |  | 2.4 |  |  | 6.4 |
Net periodic benefit cost | $ | 8.4 |  |  | $ | 11.4 |  |  | $ | (0.6 | ) |  | $ | 0.8 |  |  | $ | 7.8 |  |  | $ | 12.2 |
| Pension benefits |  | Other retirement benefits |  | Total
| 2014 |  | 2013 |  | 2014 |  | 2013 |  | 2014 |  | 2013
U.S. plans | $ | 6.1 |  |  | $ | 8.9 |  |  | $ | (0.6 | ) |  | $ | 0.8 |  |  | $ | 5.5 |  |  | $ | 9.7 |
International plans | 2.3 |  |  | 2.5 |  |  | — |  |  | — |  |  | 2.3 |  |  | 2.5 |
Net periodic benefit cost | $ | 8.4 |  |  | $ | 11.4 |  |  | $ | (0.6 | ) |  | $ | 0.8 |  |  | $ | 7.8 |  |  | $ | 12.2 |

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