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Restructuring and Other Items, net (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Restructuring, settlement and impairment provisions [Abstract] |  |  |
Annualized savings from reduction of workforce | $ 12.0 |  |
Restructuring Charges [Abstract] |  |  |
Impairment of assets | 7.5 | $ 0.7 | $ 5.3
Severance and other employee costs | 5.7 | 1.8 | 10.8
Total restructuring and other items, net | 13.2 | 2.5 | 15.0
Restructuring Reserve [Roll Forward] |  |  |
Restructuring liability, beginning of period | 2.5 |  |
Additional provisions | 5.7 |  |
Cash payments | (3.2) |  |
Other | 0.0 |  |
Restructuring liability, ending of period | 5.0 | 2.5 |
Performance Materials [Member] |  |  |
Restructuring Charges [Abstract] |  |  |
Impairment of assets | 4.2 | 0.0 | 0.0
Severance and other employee costs | 2.8 | 0.0 | 0.0
Specialty Minerals [Member] |  |  |
Restructuring Charges [Abstract] |  |  |
Impairment of assets | 1.6 | 0.7 | 5.3
Severance and other employee costs | 0.9 | 0.0 | 5.0
Refractories [Member] |  |  |
Restructuring Charges [Abstract] |  |  |
Severance and other employee costs | 0.8 | 0.0 | 0.0
Energy Services [Member] |  |  |
Restructuring Charges [Abstract] |  |  |
Impairment of assets | 1.7 | 0.0 | 0.0
Severance and other employee costs | 0.1 | 1.8 | 1.7
Other | 0.0 | 0.0 | (1.1)
Corporate [Member] |  |  |
Restructuring Charges [Abstract] |  |  |
Severance and other employee costs | $ 1.1 | $ 0.0 | $ 4.1

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