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Selected Quarterly Financial Data (Unaudited) - Footnote Figures (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Nov. 30, 2018
Aug. 31, 2018
May 31, 2018
Feb. 28, 2018
Nov. 30, 2017
Aug. 31, 2017
May 31, 2017
Feb. 28, 2017
Nov. 30, 2018
Nov. 30, 2017
Nov. 30, 2016
Condensed Income Statements, Captions [Line Items]                      
Depreciation expense                 $ 26.4 $ 24.4 $ 26.8
Inventory, LIFO Reserve, Effect on Income, Net $ 0.6 $ 0.9 $ 1.5 $ 0.8 $ 1.0 $ (1.2) $ 0.3 $ 1.3      
Income tax (Expense) Benefit                 (6.2) 83.7 10.3
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount         75.7         79.9  
Manufacturing Facilities and Equipment [Member]                      
Condensed Income Statements, Captions [Line Items]                      
Depreciation expense $ 5.4 $ 5.5 $ 5.0 $ 4.9 $ 5.0 $ 4.8 $ 4.8 $ 4.7 $ 20.8 $ 19.2 $ 22.3