Employee Benefits (Narrative) (Details) (USD $)					3 Months Ended
	Feb. 28, 2014 Retirement Income Plan	Dec. 31, 2013 Retirement Income Plan	Feb. 28, 2014 Excess Benefit Plan	Dec. 31, 2013 Excess Benefit Plan	Mar. 31, 2014 Retirement Plans	Feb. 28, 2014 Retirement Plans
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Employer Contribution					$ 3,500,000
Defined Benefit Plan, Expected Contributions in Current Fiscal Year					8,700,000
Defined Benefit Plan, Discount Rate	4.60%	4.90%	4.50%	4.90%
Defined Benefit Plan, Decrease in Accumulated Benefit Obligation due to Plan Amendment						19,700,000
Increase in Other Comprehensive Income Arising During Period, before Tax						19,700,000
Defined Benefit Plan Increase in Expected Future Benefit Payments Next Five Years						17,200,000
Defined Benefit Plan, Decrease in Net Periodic Benefit Cost due to Change of Actuarial Assumptions and Plan Amendment						$ 8,400,000