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Retirement Benefits | 9 Months Ended
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Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract] |
Retirement Benefits | Retirement Benefits The following table presents the components of net periodic pension cost and amounts recognized in other comprehensive income (loss) for our pension plans:
|  | Three Months Ended |  | Nine Months Ended
|  | September 30, |  | September 30,
(in millions) |  | 2015 |  | 2014 |  | 2015 |  | 2014
Components of net periodic pension cost: |  |  |  |  |  |  |  |
Service cost |  | $ | 0.4 |  |  | $ | 0.4 |  |  | $ | 1.1 |  |  | $ | 1.1 |
Interest cost |  | 0.5 |  |  | 0.8 |  |  | 1.4 |  |  | 1.9 |
Expected return on plan assets |  | (0.5 | ) |  | (0.8 | ) |  | (1.6 | ) |  | (2.1 | )
Amortization of net actuarial losses(a) |  | 0.1 |  |  | 0.1 |  |  | 0.5 |  |  | 0.3 |
Amortization of transitional obligation |  | (0.1 | ) |  | — |  |  | (0.1 | ) |  | — |
Net periodic pension cost |  | $ | 0.4 |  |  | $ | 0.5 |  |  | $ | 1.3 |  |  | $ | 1.2 |
(a) | Reflects amounts reclassified from accumulated other comprehensive income (loss) to net income.
In the nine months ended September 30, 2015, we contributed $1.6 million to our pension plans. In 2015, we expect to contribute approximately $2.1 million to our pension plans.

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