Variable Interest Entities (Narrative) (Details) - USD ($) $ in Millions	9 Months Ended
	Aug. 31, 2016	Nov. 30, 2015
Variable Interest Entity [Line Items]
Assets from entities consolidated during period	$ 122.1
Liabilities from entities consolidated during period	96.4
Consolidated VIEs assets	596.6	$ 652.3
Consolidated VIEs liabilities	136.8	84.4
Variable Interest Entity, Not Primary Beneficiary Including Third Parties
Variable Interest Entity [Line Items]
Decrease in consolidated inventory	68.2
Non-refundable option deposits and pre-acquisition costs	85.7	89.2
Financial Standby Letters of Credit | Variable Interest Entity, Not Primary Beneficiary Including Third Parties
Variable Interest Entity [Line Items]
Letters of credit outstanding	$ 53.1	$ 70.4