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Other Operating Charges, net (Tables)
9 Months Ended
Sep. 30, 2021
Other Income and Expenses [Abstract]  
Schedule of Other Operating Cost and Expense, by Component [Table Text Block]
Quarter Ended September 30,Nine Months Ended September 30,
2021202020212020
Costs associated with mill closure$5.4 $— $47.1 $— 
Reorganization and other expenses 3.4 — 7.3 3.4 
Union settlement— — — 6.6 
Gain on divested assets— — — (1.4)
Directors' equity-based compensation 1.4 0.3 0.6 2.5 
Other— — — 0.8 
$10.2 $0.3 $55.1 $11.9