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Discontinued Operations - Classes of Assets and Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Assets:    
Current assets of discontinued operation $ 0.0 $ 15.9
Liabilities    
Current liabilities of discontinued operation $ 0.0 2.3
Discontinued operations | Engineered Materials Segment    
Assets:    
Accounts receivable   3.8
Inventories   3.1
Property, plant and equipment   7.6
Intangible assets   1.2
Other assets   0.2
Current assets of discontinued operation   15.9
Liabilities    
Accounts payable   1.4
Accrued expenses   0.9
Current liabilities of discontinued operation   $ 2.3