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Retirement Plans (Tables) | 6 Months Ended
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Jun. 30, 2018
Retirement Benefits [Abstract] |
Components of net periodic benefit cost | 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 | ) |  | $ | — |

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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + 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) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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