Fair Value Measurements-Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) (Recurring [Member], USD $) In Millions, unless otherwise specified	Aug. 31, 2012	Nov. 30, 2011	Aug. 31, 2011
Fair Value [Member]
Assets [Abstract]
Cash and cash equivalents	$ 72.2	$ 53.9	$ 52.2
Insurance contracts	71.1	59.1	59.3
Bonds & other long-term investments	12.9	12.3	12.9
Interest rate derivatives	16.6	18.9	18.9
Foreign currency derivatives	0.7	2.7	1.9
Total assets	173.5	146.9	145.2
Liabilities [Abstract]
Foreign currency derivatives	1.6	0.4	2.9
Level 1 [Member]
Assets [Abstract]
Cash and cash equivalents	72.2	53.9	52.2
Insurance contracts	0	0	0
Bonds & other long-term investments	12.9	12.3	12.9
Interest rate derivatives	0	0	0
Foreign currency derivatives	0	0	0
Total assets	85.1	66.2	65.1
Liabilities [Abstract]
Foreign currency derivatives	0	0	0
Level 2 [Member]
Assets [Abstract]
Cash and cash equivalents	0	0	0
Insurance contracts	71.1	59.1	59.3
Bonds & other long-term investments	0	0	0
Interest rate derivatives	16.6	18.9	18.9
Foreign currency derivatives	0.7	2.7	1.9
Total assets	88.4	80.7	80.1
Liabilities [Abstract]
Foreign currency derivatives	1.6	0.4	2.9
Level 3 [Member]
Assets [Abstract]
Cash and cash equivalents	0	0	0
Insurance contracts	0	0	0
Bonds & other long-term investments	0	0	0
Interest rate derivatives	0	0	0
Foreign currency derivatives	0	0	0
Total assets	0	0	0
Liabilities [Abstract]
Foreign currency derivatives	$ 0	$ 0	$ 0