Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Nov. 30, 2018	Nov. 30, 2017
Deferred Tax Assets
Accrued estimated costs	$ 5.7	$ 9.7
Inventory	6.1	15.0
Goodwill and intangible assets	0.0	0.0
Depreciation	0.0	0.0
Pension	12.6	24.9
NOLC’s and other carryforwards	37.3	51.5
Post-retirement employee benefits	2.3	3.9
Other	0.0	0.0
Valuation allowance	(53.2)	(88.8)
Deferred Tax Assets, Net	10.8	16.2
Deferred Tax Liabilities
Accrued estimated costs	0.0	0.0
Inventory	0.0	0.0
Goodwill and intangible assets	11.2	17.0
Depreciation	12.4	16.6
Other	0.4	5.9
Deferred Tax Liabilities	$ 24.0	$ 39.5