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Retirement Plans | 6 Months Ended
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Jun. 30, 2017
Compensation and Retirement Disclosure [Abstract] |
Retirement Plans | Retirement Plans The components of the net periodic benefit cost for our plans were as follows:
| Defined Benefit Pension Plans
| 3 Months Ended | 6 Months Ended
| June 30, | June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Service cost | $ | 2.4 |  |  | $ | 1.8 |  |  | $ | 4.8 |  |  | $ | 3.4 |
Interest cost | 2.8 |  |  | 3.0 |  |  | 5.5 |  |  | 6.0 |
Expected return on assets | (2.6 | ) |  | (3.0 | ) |  | (5.2 | ) |  | (5.9 | )
Other | 0.7 |  |  | 0.3 |  |  | 1.3 |  |  | 0.6 |
Total benefit cost | $ | 3.3 |  |  | $ | 2.1 |  |  | $ | 6.4 |  |  | $ | 4.1 |
| Retiree Health Care Plan
| 3 Months Ended | 6 Months Ended
| June 30, | June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Interest cost | $ | 0.2 |  |  | $ | 0.2 |  |  | $ | 0.3 |  |  | $ | 0.4 |
Prior service credit | (0.2 | ) |  | (0.2 | ) |  | (0.3 | ) |  | (0.4 | )
Total benefit cost | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
During the three and six months ended June 30, 2017, contributions made to our pension plans were $3.8 and $5.2, respectively, and contributions made to our retiree health care plan were $0.2 and $0.5, respectively. During 2017, we expect to make total contributions of approximately $9.0 to our pension plans and to fund our retiree health care payments as incurred.

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