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v3.19.3.a.u2

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

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