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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2018
Accounting Policies [Abstract] |
Components of Inventories | The components of inventories were as follows (dollars in millions):
|  | December 31, |
|  | 2018 |  |  | 2017 |
Raw materials |  | $ | 307.8 |  |  | $ | 279.8 |
Work in process |  |  | 13.9 |  |  |  | 12.6 |
Finished goods |  |  | 199.0 |  |  |  | 217.0 |
Supplies and materials |  |  | 274.9 |  |  |  | 253.1 |
Inventories |  | $ | 795.6 |  |  | $ | 762.5 |
Property, Plant and Equipment (at cost) | Property, plant, and equipment consisted of the following (dollars in millions):
|  | December 31, |
|  | 2018 |  |  | 2017 |
Land and land improvements |  | $ | 161.9 |  |  | $ | 156.0 |
Buildings |  |  | 795.5 |  |  |  | 729.8 |
Machinery and equipment |  |  | 5,481.6 |  |  |  | 5,162.5 |
Construction in progress |  |  | 176.7 |  |  |  | 194.5 |
Other |  |  | 75.4 |  |  |  | 68.4 |
Property, plant and equipment, at cost |  |  | 6,691.1 |  |  |  | 6,311.2 |
Less accumulated depreciation |  |  | (3,582.5 | ) |  |  | (3,386.3 | )
Property, plant and equipment, net |  | $ | 3,108.6 |  |  | $ | 2,924.9 |
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 capital 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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