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Pension and Postretirement Health and Life Benefits (Tables) | 9 Months Ended
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Sep. 30, 2021
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Net Benefit Costs [Table Text Block] | The components of net periodic benefit (credits) for the defined benefit pension plans were as follows (in millions):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Service costs | $ | 0.6 |  |  | $ | 0.9 |  |  | $ | 2.0 |  |  | $ | 2.7 |
Interest costs | 4.6 |  |  | 6.0 |  |  | 13.6 |  |  | 18.2 |
Amortization of prior service costs (credits), net | (0.1) |  |  | — |  |  | (0.1) |  |  | (0.2) |
Expected return on plan assets (gains) | (9.6) |  |  | (9.3) |  |  | (28.8) |  |  | (28.1) |
Net periodic benefit (credits) | $ | (4.5) |  |  | $ | (2.4) |  |  | $ | (13.3) |  |  | $ | (7.4) |
The components of net periodic benefit costs for the postretirement health and life benefit plans were as follows (in millions):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Interest costs | $ | 0.9 |  |  | $ | 1.2 |  |  | $ | 2.6 |  |  | $ | 3.6 |
Amortization of prior service costs (credits), net | — |  |  | (0.1) |  |  | (0.1) |  |  | (0.1) |
Net periodic benefit costs | $ | 0.9 |  |  | $ | 1.1 |  |  | $ | 2.5 |  |  | $ | 3.5 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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