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Discontinued Operations - Results of Discontinued Operations (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Impairment charges $ 0.0 $ 0.0 $ (1.5)
Net gain on disposition of discontinued operations 0.0 0.0 6.6
Superform U.S Business | Discontinued operations, held-for-sale      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Net sales 8.2 7.7 20.9
Cost of goods sold (6.4) (6.9) (21.8)
Gross profit / (loss) 1.8 0.8 (0.9)
Selling, general and administrative expenses (1.7) (0.9) (2.9)
Restructuring charges (0.2) (0.3) (1.0)
Acquisition and disposal credit / (costs) 0.2 (2.0) 0.0
Impairment charges 0.0 (2.6) (1.5)
Income / (loss) before income taxes 0.1 (5.0) (6.3)
Provision for income taxes 0.6 (0.1) (0.4)
Income / (loss) after income taxes 0.7 (5.1) (6.7)
Net gain on disposition of discontinued operations 0.0 0.0 6.6
Net income / (loss) $ 0.7 $ (5.1) $ (0.1)