Variable Interest Entities (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Feb. 28, 2017	Nov. 30, 2016
Variable Interest Entity [Line Items]
Consolidated VIEs assets	$ 651.1	$ 536.3
Consolidated VIEs liabilities	170.1	126.4
Variable Interest Entity, Not Primary Beneficiary Including Third Parties
Variable Interest Entity [Line Items]
Decrease in consolidated inventory	35.1
Non-refundable option deposits and pre-acquisition costs	73.6	85.0
Financial Standby Letters of Credit | Variable Interest Entity, Not Primary Beneficiary Including Third Parties
Variable Interest Entity [Line Items]
Letters of credit outstanding	$ 40.6	$ 45.1