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Employee Benefit Plans (Tables)

6 Months Ended

Mar. 31, 2026

Retirement Benefits [Abstract]

Components of Pension and Other Postretirement Benefit Income

The following table summarizes the components of Net pension and other postretirement plan income within the Condensed Consolidated Statements of Comprehensive Income:

						Pension benefits												Other postretirement benefits
(In millions)															2026															2025						2026						2025
Three months ended March 31
Interest cost						$	17.0					$	17.5					$	0.2					$	0.2
Expected return on plan assets						(17.9)						(18.1)						—						—
Amortization of prior service credits						—						—						(0.5)						(0.5)
Net periodic benefit income						$	(0.9)					$	(0.6)					$	(0.3)					$	(0.3)
Six months ended March 31
Interest cost						$	33.9					$	34.9					$	0.5					$	0.5
Expected return on plan assets						(35.7)						(36.1)						—						—
Amortization of prior service credits						—						—						(1.1)						(1.1)
Net periodic benefit income						$	(1.8)					$	(1.2)					$	(0.6)					$	(0.6)

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- 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://www.xbrl.org/2009/role/commonPracticeRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (q)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-5

Reference 2: 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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