Retirement Benefits - Schedule of Estimated Future Benefit Payments (Detail) (USD $) In Millions, unless otherwise specified	Nov. 30, 2013
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Estimated future Net Benefit Payments, 2014	$ 128.6
Estimated future Net Benefit Payments, 2015	126.4
Estimated future Net Benefit Payments, 2016	123.7
Estimated future Net Benefit Payments, 2017	120.6
Estimated future Net Benefit Payments, 2018	117.2
Estimated future Net Benefit Payments, Years 2019 - 2023	533.6
Medical and Life Insurance Benefits [Member]
Pension Plans, Postretirement and Other Employee Benefits [Line Items]
Estimated future Net Benefit Payments, 2014	7.3
Estimated future Net Benefit Payments, 2015	7.1
Estimated future Net Benefit Payments, 2016	7.0
Estimated future Net Benefit Payments, 2017	6.7
Estimated future Net Benefit Payments, 2018	6.5
Estimated future Net Benefit Payments, Years 2019 - 2023	26.0
Estimated future Gross Benefit Payments, 2014	7.7
Estimated future Gross Benefit Payments, 2015	7.5
Estimated future Gross Benefit Payments, 2016	7.4
Estimated future Gross Benefit Payments, 2017	7.1
Estimated future Gross Benefit Payments, 2018	6.7
Estimated future Gross Benefit Payments, Years 2019 - 2023	26.9
Estimated future Medicare D Subsidy, 2014	0.4
Estimated future Medicare D Subsidy, 2015	0.4
Estimated future Medicare D Subsidy, 2016	0.4
Estimated future Medicare D Subsidy, 2017	0.4
Estimated future Medicare D Subsidy, 2018	0.2
Estimated future Medicare D Subsidy, Years 2019 - 2023	$ 0.9