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Restructuring and Other Items, net (Details) $ in Millions	3 Months Ended			12 Months Ended
	Oct. 03, 2021 USD ($)	Sep. 27, 2020 USD ($)	Jun. 28, 2020 USD ($) Mill	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Restructuring Charges [Abstract]
Asset write-down charges				$ 0.7	$ 7.1	$ 7.5
Severance and other related costs				0.4	0.5	5.7
Total restructuring and other items, net				1.1	7.6	13.2
Restructuring Liability [Roll Forward]
Restructuring liability, beginning of period				3.6	5.0
Additional provisions				0.1	0.3
Cash payments				(1.5)	(1.6)
Other				0.0	(0.1)
Restructuring liability, end of period				2.2	3.6	5.0
Performance Materials [Member]
Restructuring Charges [Abstract]
Asset write-down charges				0.0	0.0	5.9
Severance and other related costs				0.0	0.0	2.9
Specialty Minerals [Member]
Restructuring Charges [Abstract]
Asset write-down charges				0.7	7.1	1.6
Severance and other related costs				0.4	0.5	0.9
Specialty Minerals [Member] | Paper PCC [Member]
Restructuring and Other Items, Net [Abstract]
Number of mills with lease terminations | Mill			1
Restructuring Charges [Abstract]
Asset write-down charges	$ 0.7	$ 1.1	$ 6.0
Severance and other related costs	$ 0.4		$ 0.3
Refractories [Member]
Restructuring Charges [Abstract]
Severance and other related costs				0.0	0.0	0.8
Corporate [Member]
Restructuring Charges [Abstract]
Severance and other related costs				$ 0.0	$ 0.0	$ 1.1
Verso Papers [Member]
Restructuring and Other Items, Net [Abstract]
Number of paper mills being idled indefinitely | Mill			2

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Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan and expenses resulting from the write-down of assets. Excludes expenses related to a business combination, a discontinued operation or an asset retirement obligation.

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

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