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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