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Stock and Stock-Based Incentive Plans Stock and Stock-Based Incentive Plans (Stock-Settled Restricted Stock Unit Activity) (Details) - Stock-settled market stock units - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
May 31, 2018
May 31, 2017
Feb. 28, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 519,000   419,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 202,043 158,637  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period (92,000)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (10,000)    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 74.19   $ 74.04
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value 81.86 $ 73.58  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value 90.46    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value $ 73.63    
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options $ 1.4 $ 7.0