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Other Income (Expense), Net - Components of Other Income (Expense), Net (Details) - USD ($)
$ in Millions

3 Months Ended

9 Months Ended

Sep. 30, 2025

Sep. 30, 2024

Sep. 30, 2025

Sep. 30, 2024

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Asset disposals and write-offs

$ (12.0)

$ (11.4)

$ (30.8)

$ (26.9)

DeRidder litigation and other litigation

^[1]

(3.5)

(2.0)

(3.5)

(127.7)

DeRidder litigation and other litigation insurance recovery

^[1]

3.5

2.0

3.5

127.7

Facilities closure and other (costs) income

^[2]

(1.3)

(0.3)

21.6

(0.3)

Acquisition and integration-related costs

^[3]

(5.9)

0.0

(7.5)

0.0

Other

(6.3)

(4.4)

(18.0)

(16.2)

Total

(25.5)

(16.1)

(34.7)

(51.0)

Jackson, Alabama Mill

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Jackson mill conversion-related activities (c)

^[4]

$ 0.0

$ 0.0

$ 0.0

$ (7.6)

[1]	For the three and nine months ended September 30, 2025, includes charges and income related to fully insured settlement amounts. For the three and nine months ended September 30, 2024, includes charges and income related to the DeRidder mill lawsuit for compensatory damages plus interest. For more information on the DeRidder mill lawsuit, see Note 19, Commitments, Guarantees, Indemnifications, and Legal Proceedings, of the Notes to Consolidated Financial Statements in “Part II, Item 8. Financial Statements and Supplementary Data” of our 2024 Annual Report on Form 10-K.
[2]	For the three and nine months ended September 30, 2025, includes charges and income, respectively, related to the closure of certain corrugated products facilities. For the three months ended September 30, 2025, the charges were partially offset by a gain on an asset disposal related to a closed corrugated products facility. For the nine months ended September 30, 2025, these charges were completely offset by gains from the sales of corrugated products facilities during the second quarter of 2025. For the three and nine months ended September 30, 2024, includes charges consisting of closure costs related to corrugated products facilities. For the nine months ended September 30, 2024, these charges were partially offset by income primarily related to a favorable lease buyout for a closed corrugated products facility during the first quarter of 2024.
[3]	Includes charges for acquisition and integration costs related to the September 2025 Greif Acquisition.
[4]	Includes items related to the announced discontinuation of production of uncoated freesheet paper grades on the No. 3 machine at the Jackson, Alabama mill associated with the permanent conversion of the machine to produce linerboard and other paper-to-containerboard conversion related activities.

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Amount of expense for integration-related cost incurred in connection with business combination. Includes system integration and conversion costs; severance and other employee-related costs; restructuring and other post-combination costs. Excludes acquisition-related cost incurred to effect business combination; cost to issue debt or equity securities; and cost related to acquisition of asset.

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