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Retirement Plans | 6 Months Ended
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Jun. 30, 2018
Retirement Benefits [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,
| 2018 |  | 2017 |  | 2018 |  | 2017
Service cost | $ | 2.8 |  |  | $ | 2.4 |  |  | $ | 5.6 |  |  | $ | 4.8 |
Interest cost | 2.9 |  |  | 2.8 |  |  | 5.9 |  |  | 5.5 |
Expected return on assets | (2.7 | ) |  | (2.6 | ) |  | (5.5 | ) |  | (5.2 | )
Other | 0.3 |  |  | 0.7 |  |  | 0.7 |  |  | 1.3 |
Total benefit cost | $ | 3.3 |  |  | $ | 3.3 |  |  | $ | 6.7 |  |  | $ | 6.4 |
| Retiree Health Care Plan
| 3 Months Ended | 6 Months Ended
| June 30, | June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Interest cost | $ | 0.1 |  |  | $ | 0.2 |  |  | $ | 0.2 |  |  | $ | 0.3 |
Prior service credit | (0.2 | ) |  | (0.2 | ) |  | (0.4 | ) |  | (0.3 | )
Total benefit (credit) cost | $ | (0.1 | ) |  | $ | — |  |  | $ | (0.2 | ) |  | $ | — |
During the three and six months ended June 30, 2018, contributions made to our pension plans were $2.3 and $4.2, respectively, and contributions made to our retiree health care plan were $0.3 and $0.6, respectively. During 2018, we expect to make total contributions of approximately $12.3 to our pension plans and to fund our retiree health care payments as incurred. As of January 1, 2018, we adopted the new guidance on the presentation of net periodic pension and postretirement benefit cost ("net benefit cost"). The new guidance requires bifurcation of net benefit cost, which used to be reported as an employee cost within operating income under the old guidance. The service cost component is still presented with other employee compensation cost in operating income or capitalized in assets in rare circumstances. The other components are now reported separately outside of operations, and are not eligible for capitalization. We have reclassified the 2017 non-service cost components of net benefit cost to interest and other expenses from selling and administrative expenses to conform to the current period presentation. For the three months ended June 30, 2018 and 2017, the non-service component was a cost of $0.4 and $0.6, respectively. For the six months ended June 30, 2018 and 2017, the non-service component was a cost of $0.9 and $1.5, respectively. For the year ended December 31, 2017, the non-service component was a cost of $1.0.

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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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