Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $) In Millions, unless otherwise specified	May 31, 2012	Nov. 30, 2011	May 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash and cash equivalents	$ 61.4	$ 53.9	$ 47.9
Insurance contracts	63.3	59.1	61.9
Bonds & other long-term investments	12.3	12.3	12.9
Interest rate derivatives, Assets	17.9	18.9	17.7
Foreign currency derivatives, Assets	1.7	2.7	3.5
Total	156.6	146.9	143.9
Foreign currency derivatives, Liabilities	2.7	0.4	2.7
Interest rate derivatives, Liabilities			0.9
Total			3.6
Level 1
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash and cash equivalents	61.4	53.9	47.9
Bonds & other long-term investments	12.3	12.3	12.9
Total	73.7	66.2	60.8
Level 2
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Insurance contracts	63.3	59.1	61.9
Interest rate derivatives, Assets	17.9	18.9	17.7
Foreign currency derivatives, Assets	1.7	2.7	3.5
Total	82.9	80.7	83.1
Foreign currency derivatives, Liabilities	2.7	0.4	2.7
Interest rate derivatives, Liabilities			0.9
Total			$ 3.6