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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2023
Accounting Policies [Abstract] |
Summary of Components of Inventories | The components of inventories were as follows (dollars in millions):
|  | December 31, |
|  | 2023 |  |  | 2022 |
Raw materials |  | $ | 326.2 |  |  | $ | 341.2 |
Work in process |  |  | 14.9 |  |  |  | 16.0 |
Finished goods |  |  | 200.5 |  |  |  | 198.4 |
Supplies and materials |  |  | 471.5 |  |  |  | 421.7 |
Inventories |  | $ | 1,013.1 |  |  | $ | 977.3 |
Summary of Property, Plant and Equipment (at cost) | Property, plant, and equipment consisted of the following (dollars in millions):
|  | December 31, |
|  | 2023 |  |  | 2022 |
Land and land improvements |  | $ | 197.8 |  |  | $ | 192.4 |
Buildings |  |  | 1,090.4 |  |  |  | 1,023.6 |
Machinery and equipment |  |  | 7,006.7 |  |  |  | 6,709.3 |
Construction in progress |  |  | 335.8 |  |  |  | 440.2 |
Other |  |  | 177.0 |  |  |  | 146.9 |
Property, plant and equipment, at cost |  |  | 8,807.7 |  |  |  | 8,512.4 |
Less accumulated depreciation |  |  | (4,943.9 | ) |  |  | (4,612.4 | )
Property, plant and equipment, net |  | $ | 3,863.8 |  |  | $ | 3,900.0 |
Summary of Property, Plant and Equipment Estimated Useful Lives | Depreciation is computed on the straight-line basis over the estimated useful lives of the related assets. Assets under finance leases are depreciated on the straight-line method over the term of the lease or the useful life, if shorter. The following lives are used for the various categories of assets:
Buildings and land improvements |  | 5 to 40 years
Machinery and equipment |  | 3 to 25 years
Trucks and automobiles |  | 3 to 10 years
Furniture and fixtures |  | 3 to 20 years
Computers and hardware |  | 3 to 10 years
Leasehold improvements |  | Period of the lease or useful life, if shorter

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