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Goodwill and Other Intangible Assets, Goodwill (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Goodwill [Roll Forward] |  |
Balance Beginning | $ 808.5 | $ 807.4
Change in goodwill relating to [Abstract] |  |
Acquisition of Normerica | 104.5 |
Foreign exchange translation | (5.5) | 1.1
Total changes | 99.0 | 1.1
Balance Ending | 907.5 | 808.5
Performance Materials [Member] |  |
Goodwill [Roll Forward] |  |
Balance Beginning | 752.4 | 751.2
Change in goodwill relating to [Abstract] |  |
Acquisition of Normerica | 104.5 |
Foreign exchange translation | (3.9) | 1.2
Total changes | 100.6 | 1.2
Balance Ending | 853.0 | 752.4
Specialty Minerals [Member] |  |
Goodwill [Roll Forward] |  |
Balance Beginning | 12.7 | 12.5
Change in goodwill relating to [Abstract] |  |
Acquisition of Normerica | 0.0 |
Foreign exchange translation | (0.1) | 0.2
Total changes | (0.1) | 0.2
Balance Ending | 12.6 | 12.7
Refractories [Member] |  |
Goodwill [Roll Forward] |  |
Balance Beginning | 43.4 | 43.7
Change in goodwill relating to [Abstract] |  |
Acquisition of Normerica | 0.0 |
Foreign exchange translation | (1.5) | (0.3)
Total changes | (1.5) | (0.3)
Balance Ending | $ 41.9 | $ 43.4

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