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Restructuring and Other Items, net (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Restructuring Cost and Reserve [Line Items] |  |  |
Annualized savings from reduction of workforce | $ 6.0 | $ 11.5 |
Restructuring Charges [Abstract] |  |  |
Impairment of assets charges | 5.3 | 18.5 | $ 34.2
Severance and other employee costs | 10.8 | 12.7 | 11.0
Total restructuring and other items, net | 15.0 | 28.3 | 45.2
Restructuring Reserve [Roll Forward] |  |  |
Restructuring liability, beginning of period | 3.6 |  |
Additional provisions | 10.8 |  |
Cash payments | (6.3) |  |
Restructuring liability, ending of period | 8.1 | 3.6 |
Specialty Minerals [Member] |  |  |
Restructuring Charges [Abstract] |  |  |
Impairment of assets charges | 5.3 | 0.0 | 0.0
Severance and other employee costs | 5.0 | 0.0 | 0.0
Performance Materials [Member] |  |  |
Restructuring Charges [Abstract] |  |  |
Impairment of assets charges | 0.0 | 0.0 | 0.0
Severance and other employee costs | 0.0 | 0.0 | 0.0
Refractories [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Gain on previously impaired assets |  | 2.9 |
Restructuring Charges [Abstract] |  |  |
Severance and other employee costs | 0.0 | 0.0 | 2.0
Other | 0.0 | (2.0) | 0.0
Energy Services [Member] |  |  |
Restructuring Charges [Abstract] |  |  |
Impairment of assets charges | 0.0 | 18.5 | 33.0
Severance and other employee costs | 1.7 | 12.7 | 9.0
Other | (1.1) | (0.9) | 0.0
Corporate [Member] |  |  |
Restructuring Charges [Abstract] |  |  |
Impairment of assets charges | 0.0 | 0.0 | 1.2
Severance and other employee costs | $ 4.1 | $ 0.0 | $ 0.0

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