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Employee Benefit Plans (Tables) | 3 Months Ended
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Mar. 31, 2018
Compensation And Retirement Disclosure [Abstract] |
Components of Net Periodic Benefit Cost | The components of net periodic defined benefit pension cost are presented in the table below.
| Three months ended |
| March 31, |
| 2017 |  |  | 2018 |
| (In millions) |
Service cost | $ | 2.7 |  |  | $ | 3.0 |
Interest cost |  | 3.3 |  |  |  | 3.6 |
Expected return on plan assets |  | (2.5 | ) |  |  | (3.4 | )
Amortization of prior service cost |  | .1 |  |  |  | .1 |
Recognized actuarial losses |  | 3.2 |  |  |  | 3.5 |
Total | $ | 6.8 |  |  | $ | 6.8 |
The components of net periodic postretirement benefits other than pension (“OPEB”) cost are presented in the table below.
| Three months ended |
| March 31, |
| 2017 |  |  | 2018 |
| (In millions) |
Interest cost | $ | .1 |  |  | $ | .1 |
Amortization of prior service credit |  | (.1 | ) |  |  | (.2 | )
Recognized actuarial losses |  | - |  |  |  | .1 |
Total | $ | - |  |  | $ | - |

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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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