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Retirement Plans | 6 Months Ended
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Jun. 30, 2019
Compensation And Retirement Disclosure [Abstract] |
Retirement Plans | (10) Retirement Plans The components of the net periodic benefit cost (credit) for our plans were as follows:
|  | Defined Benefit Pension Plan |
|  | 3 Months Ended |  |  | 6 Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Service cost |  | $ | 4.3 |  |  | $ | 2.8 |  |  | $ | 6.8 |  |  | $ | 5.6 |
Interest cost |  |  | 3.2 |  |  |  | 2.9 |  |  |  | 6.3 |  |  |  | 5.9 |
Expected return on assets |  |  | (3.6 | ) |  |  | (2.7 | ) |  |  | (5.9 | ) |  |  | (5.5 | )
Other |  |  | 0.4 |  |  |  | 0.3 |  |  |  | 0.9 |  |  |  | 0.7 |
Total benefit cost |  | $ | 4.3 |  |  | $ | 3.3 |  |  | $ | 8.1 |  |  | $ | 6.7 |
|  | Retiree Health Care Plan |
|  | 3 Months Ended |  |  | 6 Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Interest cost |  | $ | 0.2 |  |  | $ | 0.1 |  |  | $ | 0.3 |  |  | $ | 0.2 |
Prior service credit |  |  | (0.2 | ) |  |  | (0.2 | ) |  |  | (0.4 | ) |  |  | (0.4 | )
Total benefit credit |  | $ | - |  |  | $ | (0.1 | ) |  | $ | (0.1 | ) |  | $ | (0.2 | )
During the three and six months ended June 30, 2019, contributions made to our pension plans were $2.9 and $4.4, respectively, and contributions made to our retiree health care plan were $0.3 and $0.6, respectively. During 2019, we expect to make total contributions of approximately $13.0 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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