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Pension and Postretirement Health and Life Benefits (Tables)

9 Months Ended

Sep. 30, 2024

Defined Benefit Plan Disclosure [Line Items]

Schedule of Net Benefit Costs [Table Text Block]

The components of net periodic benefit costs (credits) for the defined benefit pension plans were as follows (in millions):

			Three Months Ended   September 30,												Nine Months Ended   September 30,
			2024						2023						2024						2023
Service costs			$	0.5					$	0.7					$	1.5					$	2.2
Interest costs			0.2						6.9						7.8						20.8
Amortization of prior service costs (credits), net			0.1						—						—						(0.1)
Remeasurement gain			(0.2)						(0.9)						(16.8)						(0.9)
Expected return on plan assets (gains)			(0.2)						(7.7)						(9.5)						(23.2)
Net periodic benefit costs (credits)			$	0.4					$	(1.0)					$	(17.0)					$	(1.2)

The components of net periodic benefit costs for the postretirement health and life benefit plan were as follows (in millions):

			Three Months Ended   September 30,												Nine Months Ended   September 30,
			2024						2023						2024						2023
Interest costs			$	1.2					$	1.2					$	3.4					$	3.7
Amortization of prior service costs (credits), net			(0.1)						(0.1)						(0.1)						(0.1)
Net periodic benefit costs			$	1.1					$	1.1					$	3.3					$	3.6

X

- 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.

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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
-Topic 715
-SubTopic 20
-Subparagraph (h)
-Name Accounting Standards Codification
-Paragraph 1
-Section 50
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

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