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Discontinued Operations - Reserves for Discontinued Operations (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Workers' compensation, product liability, and indemnification reserves	$ 1.9	$ 1.8
Reserve for discontinued operations	76.6	71.9
Workers’ compensation, product liability, and indemnification reserves
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Workers' compensation, product liability, and indemnification reserves	12.9	15.7
Postretirement medical and life insurance benefits reserve, net
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Postretirement medical and life insurance benefits reserve, net	5.5	5.9
Reserves for legal proceedings
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Reserves for legal proceedings	$ 58.2	$ 50.3

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Reserve for Discontinued Operations, excluding environmental and restructuring activities.

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Amounts of material contingent liabilities, for example, but not limited to, product or environmental liabilities or litigation, that remain with the entity despite the disposal of the disposal group that is classified as a component of the entity.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of liability, recognized in statement of financial position, for defined benefit other postretirement plan. Excludes pension plan.

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Carrying amount of accrued known and estimated losses incurred as of the balance sheet date for which no insurance coverage exists, and for which a claim has been made or is probable of being asserted, typically arising from workmen's compensation-type of incidents and personal injury to nonemployees from accidents on the entity's property that are expected to be paid after one year (or the normal operating cycle, if longer).

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