Share-Based Compensation Plans (Details) $ / shares in Units, $ in Millions	3 Months Ended	6 Months Ended
Aug. 31, 2019 USD ($) $ / shares shares	Aug. 31, 2019 USD ($) $ / shares shares
Share-based compensation plans
Exercise of stock options (in shares)	26,368	61,765
Employee purchases of common stock (in shares)	0	14,790
Employee purchases of common stock, average price (in dollars per share) \| $ / shares	$ 95.29	$ 95.29
Directors stock compensation
Share-based compensation plans
Number of awards granted (in shares)	1,048	2,304
Grant date fair value \| $	$ 0.1	$ 0.2
Grant date fair value of shares granted in period (in dollars per share) \| $ / shares	$ 134.21	$ 121.99
Restricted Stock Units (RSU)
Share-based compensation plans
Grant date fair value \| $	$ 0.5	$ 7.6
Shares vested and settled (in shares)	3,489	66,329
Grant date fair value of shares settled in period (in dollars per share) \| $ / shares	$ 146.26	$ 114.58
Shares vested (in shares)	3,489	66,329
Performance Restricted Stock Units (PSU)
Share-based compensation plans
Number of awards granted (in shares)	0	6,088
Grant date fair value \| $		$ 0.7
Grant date fair value of shares granted in period (in dollars per share) \| $ / shares		$ 110.85
Shares vested (in shares)	0	108,572
Performance Based Restricted Stock Awards (PSA)
Share-based compensation plans
Number of awards granted (in shares)	0	122,402
Grant date fair value \| $		$ 13.6
Grant date fair value of shares settled in period (in dollars per share) \| $ / shares		$ 110.85
Time-Vested \| Restricted Stock Units (RSU)
Share-based compensation plans
Number of awards granted (in shares)	8	3,279
Grant date fair value \| $		$ 0.4
Grant date fair value of shares granted in period (in dollars per share) \| $ / shares	$ 150.86	$ 111.51
Time-Vested \| Restricted Stock Awards (RSA)
Share-based compensation plans
Number of awards granted (in shares)	4,920	45,772
Grant date fair value \| $	$ 0.7	$ 5.2
Grant date fair value of shares granted in period (in dollars per share) \| $ / shares	$ 138.86	$ 113.98
Vested and settled performance shares \| Restricted Stock Awards (RSA)
Share-based compensation plans
Grant date fair value \| $	$ 0.1	$ 0.1
Grant date fair value of shares granted in period (in dollars per share) \| $ / shares	$ 150.86	$ 150.86
Shares vested and settled (in shares)	928	928
Vested and settled performance shares \| Performance Restricted Stock Units (PSU)
Share-based compensation plans
Grant date fair value \| $		$ 14.7
Grant date fair value of shares granted in period (in dollars per share) \| $ / shares		$ 135.85
Shares vested and settled (in shares)	0	108,572

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Number of non-option equity instruments exercised by participants.

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The weighted average of per share prices paid for shares purchased on the open market for issuance to employees under the plan.

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The number of shares purchased on the open market during the period for issuance to employees under the plan.

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Value, before forfeitures, of stock or other type of equity granted of any equity-based compensation plan other than an employee stock ownership plan (ESOP).

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Number of share options (or share units) exercised during the current period.

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