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Other Operating Charges, net (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Other Operating Income (Expense), Net $ 1.8 $ (0.4) $ 1.1 $ 2.2 $ 5.7 $ 0.5 $ 2.4 $ 8.5
Operating Expense                
Reorganization Items 0.0     0.0   1.5 0.0 1.6
Asset Impairment Charges 0.3   1.1 1.2 4.6   1.4 5.8
Operating Expense | Mill Closure Costs                
Other Expenses 0.0     0.0   0.4 0.0 0.4
Other Income                
Other Operating Income 0.5     0.0     0.4 0.0
Director [Member]                
Share based compensation expense $ 1.0 $ (0.2) $ (0.2) $ 1.0 $ 1.1 $ (1.4) $ 0.6 $ 0.7