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Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2021
Accounting Policies [Abstract] |
Schedule of Basic Weighted Average Shares Reconciles to Diluted Weighted Average Shares | Basic weighted average shares outstanding reconciles to diluted weighted average shares outstanding as follows:
| 2021 |  | 2020 |  | 2019
| (In millions)
Basic weighted average common shares outstanding | 76.0 |  |  | 75.7 |  |  | 75.6 |
Dilutive effect of stock options, restricted stock and performance share units | 0.4 |  |  | 0.7 |  |  | 0.9 |
Diluted weighted average common shares outstanding | 76.4 |  |  | 76.4 |  |  | 76.5 |
Property and Equipment at Cost, Depreciation and Amortization Estimated Useful Lives | Property and equipment are stated at cost, with depreciation and amortization provided using the straight-line method over the following estimated useful lives:
Land improvements | 8 to 12 years
Buildings and improvements | 8 to 30 years
Machinery, equipment and other | 3 to 12 years
Office and transportation equipment | 2 to 10 years
Schedule of Identifiable Intangible Assets, Useful Lives | Certain identifiable intangible assets are amortized over their estimated useful lives using the straight-line method. The estimated useful lives used in the computation of amortization of identifiable intangible assets are as follows:
Patents | 5 to 15 years
Trade names | 5 to 20 years
Customer relationships | 9 to 20 years
Unpatented technology | 7 to 20 years

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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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