Income Taxes Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Nov. 30, 2016	Nov. 30, 2015
Deferred Tax Assets
Accrued estimated costs	$ 10.6	$ 9.2
Deferred Tax Assets, Goodwill and Intangible Assets	0.0	0.0
Pension	30.2	30.8
NOLC’s and other carryforwards	51.7	56.6
Post-retirement employee benefits	4.3	4.5
Other	6.2	4.0
Valuation allowance	(14.1)	(10.2)
Deferred Tax Assets, Net	88.9	94.9
Deferred Tax Liabilities
Goodwill and intangible assets	21.6	22.6
Depreciation	12.0	14.0
Deferred Tax Assets, Property, Plant and Equipment	0.0	0.0
Deferred Tax Liabilities, Other	0.0	0.0
Deferred Tax Liabilities, Net	$ 33.6	$ 36.6