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Benefit Plans | 9 Months Ended
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Sep. 30, 2015
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
| 2015 |  | 2014 |  | 2015 |  | 2014 |  | 2015 |  | 2014
Service cost | $ | 2.5 |  |  | $ | 2.3 |  |  | $ | 0.1 |  |  | $ | 0.1 |  |  | $ | 2.6 |  |  | $ | 2.4 |
Interest cost | 3.4 |  |  | 4.2 |  |  | 0.1 |  |  | 0.1 |  |  | 3.5 |  |  | 4.3 |
Expected return on assets | (4.9 | ) |  | (4.7 | ) |  | — |  |  | — |  |  | (4.9 | ) |  | (4.7 | )
Amortization of prior service credit | (0.3 | ) |  | (0.3 | ) |  | — |  |  | — |  |  | (0.3 | ) |  | (0.3 | )
Recognized actuarial losses (gains) | 1.6 |  |  | 1.3 |  |  | (0.4 | ) |  | (0.5 | ) |  | 1.2 |  |  | 0.8 |
Settlements | 49.0 |  |  | — |  |  | — |  |  | — |  |  | 49.0 |  |  | — |
Net periodic benefit cost | $ | 51.3 |  |  | $ | 2.8 |  |  | $ | (0.2 | ) |  | $ | (0.3 | ) |  | $ | 51.1 |  |  | $ | 2.5 |
| Pension benefits |  | Other retirement benefits |  | Total
| 2015 |  | 2014 |  | 2015 |  | 2014 |  | 2015 |  | 2014
U.S. plans | $ | 50.7 |  |  | $ | 2.0 |  |  | $ | (0.2 | ) |  | $ | (0.3 | ) |  | $ | 50.5 |  |  | $ | 1.7 |
International plans | 0.6 |  |  | 0.8 |  |  | — |  |  | — |  |  | 0.6 |  |  | 0.8 |
Net periodic benefit cost | $ | 51.3 |  |  | $ | 2.8 |  |  | $ | (0.2 | ) |  | $ | (0.3 | ) |  | $ | 51.1 |  |  | $ | 2.5 |
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
| 2015 |  | 2014 |  | 2015 |  | 2014 |  | 2015 |  | 2014
Service cost | $ | 8.0 |  |  | $ | 7.4 |  |  | $ | 0.4 |  |  | $ | 0.3 |  |  | $ | 8.4 |  |  | $ | 7.7 |
Interest cost | 11.2 |  |  | 12.7 |  |  | 0.3 |  |  | 0.3 |  |  | 11.5 |  |  | 13.0 |
Expected return on assets | (16.3 | ) |  | (14.4 | ) |  | — |  |  | — |  |  | (16.3 | ) |  | (14.4 | )
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) | 4.8 |  |  | 3.6 |  |  | (1.1 | ) |  | (1.2 | ) |  | 3.7 |  |  | 2.4 |
Settlements | 49.0 |  |  | — |  |  | — |  |  | — |  |  | 49.0 |  |  | — |
Net periodic benefit cost | $ | 55.8 |  |  | $ | 8.4 |  |  | $ | (0.4 | ) |  | $ | (0.6 | ) |  | $ | 55.4 |  |  | $ | 7.8 |
| Pension benefits |  | Other retirement benefits |  | Total
| 2015 |  | 2014 |  | 2015 |  | 2014 |  | 2015 |  | 2014
U.S. plans | $ | 53.8 |  |  | $ | 6.1 |  |  | $ | (0.4 | ) |  | $ | (0.6 | ) |  | $ | 53.4 |  |  | $ | 5.5 |
International plans | 2.0 |  |  | 2.3 |  |  | — |  |  | — |  |  | 2.0 |  |  | 2.3 |
Net periodic benefit cost | $ | 55.8 |  |  | $ | 8.4 |  |  | $ | (0.4 | ) |  | $ | (0.6 | ) |  | $ | 55.4 |  |  | $ | 7.8 |
During the third quarter of 2015, we recorded a $49.0 million pension settlement charge within other expense, in connection with our purchase of a group annuity contract from Metropolitan Life Insurance Company (“MetLife”) to settle $139.4 million of our $313.6 million outstanding pension benefit obligation under our U.S. qualified pension plan. MetLife will assume the obligation to pay future pension benefits and provide administrative services beginning November 1, 2015 for approximately 1,750 retirees and surviving beneficiaries who retired prior to January 1, 2015 and are currently receiving payments from this plan. The purchase was funded directly by plan assets. In addition, we made contributions to the U.S. qualified pension plan in the amount of $1.3 million in September 2015 and $13.7 million in October 2015, in order to maintain the plan's funded status as of the transaction date.

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