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Retirement Plans (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Net Periodic Benefit Cost |  |  |  |  |
Non-service component cost | $ 0.4 | $ 0.6 | $ 0.9 | $ 1.5 | $ 1.0
Defined Benefit Pension Plans |  |  |  |  |
Net Periodic Benefit Cost |  |  |  |  |
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 |
Contributions to pension plans | 2.3 |  | 4.2 |  |
Estimated employer contribution to pension plans during current fiscal year | 12.3 |  | 12.3 |  |
Retiree Health Care Plan |  |  |  |  |
Net Periodic Benefit Cost |  |  |  |  |
Interest cost | 0.1 | 0.2 | 0.2 | 0.3 |
Prior service credit | (0.2) | (0.2) | (0.4) | (0.3) |
Total benefit cost | (0.1) | $ 0.0 | (0.2) | $ 0.0 |
Contributions to retiree health care plan | $ 0.3 |  | $ 0.6 |  |

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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of contributions expected to be received by defined benefit plan from employer in fiscal year. Excludes contributions paid by employer in current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2709-114920 + Details
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