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Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2020
Goodwill And Intangible Assets Disclosure [Abstract] |
Changes in Carrying Amount of Goodwill | The Component Products Segment goodwill is assigned to the security products reporting unit within that operating segment.
| Operating segment |  |  |  |  |
| Chemicals |  |  | Component Products |  |  | Total |
| (In millions) |
Balance at December 31, 2018, 2019 and 2020 | $ | 352.6 |  |  | $ | 27.1 |  |  | $ | 379.7 |

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13854-109267 + Details
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