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Inventories (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Inventory [Line Items]    
Logs $ 88.1 $ 60.3
Other raw materials 24.0 20.8
Semi-finished inventory 22.1 24.3
Finished products 195.2 153.7
Total $ 329.4 $ 259.1