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Goodwill and Other Intangible Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Goodwill [Roll Forward]    
Balance Beginning $ 812.4 $ 779.3
Change in goodwill relating to [Abstract]    
Acquisition of Sivomatic   35.0
Foreign exchange translation (5.0) (1.9)
Total (5.0) 33.1
Balance Ending $ 807.4 812.4
Finite-Lived Intangible Assets [Abstract]    
Weighted average useful life 32 years  
Gross carrying amount $ 253.8 255.9
Accumulated amortization 50.8 41.8
Performance Materials [Member]    
Goodwill [Roll Forward]    
Balance Beginning 755.9 720.9
Change in goodwill relating to [Abstract]    
Acquisition of Sivomatic   35.0
Foreign exchange translation (4.7) 0.0
Total (4.7) 35.0
Balance Ending 751.2 755.9
Specialty Minerals [Member]    
Goodwill [Roll Forward]    
Balance Beginning 12.3 12.7
Change in goodwill relating to [Abstract]    
Acquisition of Sivomatic   0.0
Foreign exchange translation 0.2 (0.4)
Total 0.2 (0.4)
Balance Ending 12.5 12.3
Refractories [Member]    
Goodwill [Roll Forward]    
Balance Beginning 44.2 45.7
Change in goodwill relating to [Abstract]    
Acquisition of Sivomatic   0.0
Foreign exchange translation (0.5) (1.5)
Total (0.5) (1.5)
Balance Ending $ 43.7 44.2
Trade Names [Member]    
Finite-Lived Intangible Assets [Abstract]    
Weighted average useful life 35 years  
Gross carrying amount $ 203.9 204.2
Accumulated amortization $ 32.5 26.6
Technology [Member]    
Finite-Lived Intangible Assets [Abstract]    
Weighted average useful life 13 years  
Gross carrying amount $ 18.8 18.8
Accumulated amortization $ 8.0 6.4
Patents and Trademarks [Member]    
Finite-Lived Intangible Assets [Abstract]    
Weighted average useful life 19 years  
Gross carrying amount $ 6.4 6.4
Accumulated amortization $ 5.9 5.6
Customer Relationships [Member]    
Finite-Lived Intangible Assets [Abstract]    
Weighted average useful life 22 years  
Gross carrying amount $ 24.7 26.5
Accumulated amortization $ 4.4 $ 3.2