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OTHER ASSETS (Tables) | 9 Months Ended
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Sep. 30, 2025
Other Assets [Abstract] |
Schedule of Other Assets | Included in other assets were the following:
| September 30, 2025 |  | December 31, 2024 |  | September 30, 2024
Other Assets | ($ in millions)
Supply contracts | $ | 986.4 |  |  | $ | 1,047.3 |  |  | $ | 1,067.2 |
Pension assets | 69.1 |  |  | 43.3 |  |  | 1.7 |
Investments in non-consolidated affiliates | 21.8 |  |  | 23.0 |  |  | — |
Other | 93.1 |  |  | 71.5 |  |  | 62.6 |
Other assets | $ | 1,170.4 |  |  | $ | 1,185.1 |  |  | $ | 1,131.5 |
For the nine months ended September 30, 2024, payments of $58.6 million were made under other long-term supply contracts for energy modernization projects in the U.S. Gulf Coast. Amortization expense of $20.9 million and $18.3 million for the three months ended September 30, 2025 and 2024, respectively, and amortization expense of $62.7 million and $54.9 million for the nine months ended September 30, 2025 and 2024, respectively, was recognized within cost of goods sold related to our long-term supply contracts and is reflected in depreciation and amortization on the condensed statements of cash flows.
Investments in and Advances to Affiliates | Investments in Non-consolidated Affiliates Olin Corporation and Plug Power, Inc. have a joint venture named Hidrogenii, LLC (Hidrogenii), a strategic partnership that aims to leverage the strengths of both companies to advance hydrogen production and utilization. The joint venture began with the construction of a 15-ton-per-day hydrogen liquefaction plant in St. Gabriel, LA, which commenced operations in the second quarter 2025. Hidrogenii is owned 50% by Plug Power LA JV, LLC, a wholly owned subsidiary of Plug Power, Inc., and 50% by Niloco Hydrogen Holdings LLC, a wholly owned subsidiary of Olin Corporation. The investments in, and the operating results of, 50%-or-less-owned entities not controlled by Olin are included in the condensed financial statements using the equity method basis of accounting and classified as non-consolidated affiliates. The following table summarizes our investments in non-consolidated affiliates:
| Nine Months Ended September 30, 2025
Investments in Non-consolidated Affiliates | ($ in millions)
Balance at beginning of year | $ | 23.0 |  |  |
Capital contributions | 1.6 |  |  |
Losses of non-consolidated affiliates | (2.4) |  |  |
Other(1) | 0.4 |  |  |
Balance at end of period | $ | 21.8 |  |  |
(1)Represents the impact of Olin’s portion of the investment tax credit of $22.0 million, which is the basis difference between our equity ownership of Hidrogenii and Olin’s investment, and will be recognized over the useful life of the underlying operational assets.

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- Definition Tabular disclosure of investments in and advances to affiliates. Does not include the tabular disclosure of the disaggregation of investments in and advances to affiliates across legal entities. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-6 + Details
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