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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2021
Accounting Policies [Abstract] |
Components of Inventories | The components of inventories were as follows (dollars in millions):
|  | December 31, |
|  | 2021 |  |  | 2020 |
Raw materials |  | $ | 324.2 |  |  | $ | 263.5 |
Work in process |  |  | 16.2 |  |  |  | 11.6 |
Finished goods |  |  | 201.0 |  |  |  | 183.6 |
Supplies and materials |  |  | 361.1 |  |  |  | 329.2 |
Inventories |  | $ | 902.5 |  |  | $ | 787.9 |
Property, Plant and Equipment (at cost) | Property, plant, and equipment consisted of the following (dollars in millions):
|  | December 31, |
|  | 2021 |  |  | 2020 |
Land and land improvements |  | $ | 189.8 |  |  | $ | 179.6 |
Buildings |  |  | 938.7 |  |  |  | 858.5 |
Machinery and equipment |  |  | 6,159.1 |  |  |  | 5,826.6 |
Construction in progress |  |  | 481.0 |  |  |  | 360.0 |
Other |  |  | 102.9 |  |  |  | 88.8 |
Property, plant and equipment, at cost |  |  | 7,871.5 |  |  |  | 7,313.5 |
Less accumulated depreciation |  |  | (4,342.5 | ) |  |  | (4,120.1 | )
Property, plant and equipment, net |  | $ | 3,529.0 |  |  | $ | 3,193.4 |
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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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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