7. PROPERTY, PLANT AND EQUIPMENT Property, plant and equipment at December 31, 2025 and 2024 consists of the following: | | | | | | | | | | | | | | | | | | | (In millions) | 2025 | | 2024 | | Estimated
useful lives in
years | | Land | $ | 79.9 | | | $ | 47.2 | | | | | Buildings and improvements | 1,041.0 | | | 849.8 | | | 5-35 | | Manufacturing equipment | 877.5 | | | 799.6 | | | 5-10 | | Canisters and cylinders | 218.5 | | | 204.0 | | | 3-12 | | Molds | 90.4 | | | 85.4 | | | 3-5 | | Office furniture and lab equipment | 372.1 | | | 338.2 | | | 3-8 | | Construction in progress | 175.9 | | | 356.1 | | | | | Total property, plant and equipment | 2,855.3 | | | 2,680.3 | | | | | Less accumulated depreciation | 1,219.2 | | | 1,057.4 | | | | | Property, plant and equipment, net | $ | 1,636.1 | | | $ | 1,622.9 | | | |
The table below sets forth the depreciation expense for the years ended December 31, 2025, 2024 and 2023:
| | | | | | | | | | | | | | | | | | | (In millions) | 2025 | | 2024 | | 2023 | | Depreciation expense | $ | 205.3 | | | $ | 188.1 | | | $ | 172.7 | |
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