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Retirement Plans | 3 Months Ended
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Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract] |
Retirement Plans | Retirement Plans The components of the net periodic benefit cost for our plans were as follows:
| 3 Months Ended March 31,
| Defined Benefit Pension Plans | Retiree Health Care Plan
| 2017 |  | 2016 |  | 2017 |  | 2016
Service cost | $ | 2.4 |  |  | $ | 1.6 |  |  | $ | — |  |  | $ | — |
Interest cost | 2.7 |  |  | 3.0 |  |  | 0.1 |  |  | 0.2 |
Expected return on assets | (2.6 | ) |  | (2.9 | ) |  | — |  |  | — |
Other | 0.6 |  |  | 0.3 |  |  | (0.1 | ) |  | (0.2 | )
Total benefit cost | $ | 3.1 |  |  | $ | 2.0 |  |  | $ | — |  |  | $ | — |
During the three months ended March 31, 2017, contributions made to our pension plans were $1.4 and contributions made to our retiree health care plan were $0.3. During 2017, we expect to make total contributions of approximately $4.2 to our pension plans and to fund our retiree health care payments as incurred.

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