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Retirement Plans | 3 Months Ended
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Mar. 31, 2019
Retirement Benefits [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
|  | 2019 |  | 2018 |  | 2019 |  | 2018
Service cost |  | $ | 2.5 |  |  | $ | 2.8 |  |  | $ | — |  |  | $ | — |
Interest cost |  | 3.1 |  |  | 3.0 |  |  | 0.1 |  |  | 0.1 |
Expected return on assets |  | (2.3 | ) |  | (2.8 | ) |  | — |  |  | — |
Other |  | 0.5 |  |  | 0.4 |  |  | (0.2 | ) |  | (0.2 | )
Total benefit cost (credit) |  | $ | 3.8 |  |  | $ | 3.4 |  |  | $ | (0.1 | ) |  | $ | (0.1 | )
During the three months ended March 31, 2019, contributions made to our pension plans were $1.5 and contributions made to our retiree health care plan were $0.3. During 2019, we expect to make total contributions of approximately $7.9 to our pension plans and to fund our retiree health care payments as incurred.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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