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Pension and Postretirement Health and Life Benefits (Tables) | 9 Months Ended
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Sep. 30, 2018
Pension Plan, Defined Benefit [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Net Benefit Costs | The components of net periodic benefit expense (income) for the defined benefit pension plans are as follows (in millions):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Service costs | $ | 0.9 |  |  | $ | 0.9 |  |  | $ | 2.5 |  |  | $ | 2.8 |
Interest costs | 7.1 |  |  | 8.0 |  |  | 21.5 |  |  | 24.1 |
Expected gains on plan assets | (10.3 | ) |  | (10.1 | ) |  | (30.7 | ) |  | (30.5 | )
Net periodic benefit income | $ | (2.3 | ) |  | $ | (1.2 | ) |  | $ | (6.7 | ) |  | $ | (3.6 | )
Other Postretirement Benefits Plan [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Net Benefit Costs | The components of net periodic benefit expense for the postretirement health and life benefit plans are as follows (in millions):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Interest costs | $ | 1.5 |  |  | $ | 1.8 |  |  | $ | 4.4 |  |  | $ | 5.4 |
Amortization of prior service credits | — |  |  | — |  |  | (0.1 | ) |  | (0.1 | )
Net periodic benefit expense | $ | 1.5 |  |  | $ | 1.8 |  |  | $ | 4.3 |  |  | $ | 5.3 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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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