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Retirement Plans (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Net Periodic Benefit Cost |  |  |  |  |
Non-service component cost | $ 0.7 | $ 0.8 | $ 1.6 | $ 2.3 | $ 1.0
Defined Benefit Pension Plans |  |  |  |  |
Net Periodic Benefit Cost |  |  |  |  |
Service cost | 2.6 | 2.7 | 8.2 | 7.5 |
Interest cost | 2.9 | 2.9 | 8.8 | 8.4 |
Expected return on assets | (2.6) | (2.8) | (8.1) | (8.0) |
Other | 0.4 | 0.1 | 1.1 | 1.4 |
Total benefit cost (credit) | 3.3 | 2.9 | 10.0 | 9.3 |
Contributions to pension plans | 1.8 |  | 6.0 |  |
Estimated employer contribution to pension plans during current fiscal year | 10.1 |  | 10.1 |  |
Retiree Health Care Plan |  |  |  |  |
Net Periodic Benefit Cost |  |  |  |  |
Interest cost | 0.1 | 0.1 | 0.3 | 0.4 |
Net Loss | 0.1 | 0.1 | 0.1 | 0.1 |
Prior service credit | (0.2) | (0.3) | (0.6) | (0.6) |
Total benefit cost (credit) | 0.0 | $ (0.1) | (0.2) | $ (0.1) |
Contributions to retiree health care plan | $ 0.3 |  | $ 0.9 |  |

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- Definition Amount of gain (loss) 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)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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