Share-Based Compensation Plans Narrative (Details) $ / shares in Units, $ in Millions	3 Months Ended
May 31, 2019 USD ($) $ / shares shares
Schedule of Shared-based Compensation Arrangements by Share Based Payment Awards, Activity [Line Items]
Exercise of stock options (in shares)	35,397
Shares purchased under ESPP (in shares)	14,790
Average price of shares purchased (in dollars per share) \| $ / shares	$ 95.29
Restricted Stock Units (RSU)
Schedule of Shared-based Compensation Arrangements by Share Based Payment Awards, Activity [Line Items]
Number of awards granted (in shares)	3,271
Grant date fair value of RSUs settled in period (in dollars per share) \| $ / shares	$ 112.83
Grant date fair value \| $	$ 7.1
Shares vested in the period (in shares)	62,840
Shares settled in period (in shares)	62,840
Grant date fair value of shares granted in period (in dollars per share) \| $ / shares	$ 111.41
Restricted Stock Units (RSU) \| Time-Vested
Schedule of Shared-based Compensation Arrangements by Share Based Payment Awards, Activity [Line Items]
Grant date fair value \| $	$ 0.4
Restricted Stock
Schedule of Shared-based Compensation Arrangements by Share Based Payment Awards, Activity [Line Items]
Number of awards granted (in shares)	40,852
Grant date fair value of shares granted in period (in dollars per share) \| $ / shares	$ 110.98
Restricted Stock \| Time-Vested
Schedule of Shared-based Compensation Arrangements by Share Based Payment Awards, Activity [Line Items]
Grant date fair value \| $	$ 4.5
Performance Restricted Stock Units (PSU)
Schedule of Shared-based Compensation Arrangements by Share Based Payment Awards, Activity [Line Items]
Number of awards granted (in shares)	6,088
Grant date fair value \| $	$ 0.7
Shares vested in the period (in shares)	108,572
Grant date fair value of shares granted in period (in dollars per share) \| $ / shares	$ 110.85
Performance Restricted Stock Units (PSU) \| Vested and settled performance shares
Schedule of Shared-based Compensation Arrangements by Share Based Payment Awards, Activity [Line Items]
Grant date fair value \| $	$ 14.7
Shares settled in period (in shares)	108,572
Grant date fair value of shares granted in period (in dollars per share) \| $ / shares	$ 135.85
Performance Based Restricted Stock Awards
Schedule of Shared-based Compensation Arrangements by Share Based Payment Awards, Activity [Line Items]
Number of awards granted (in shares)	122,402
Grant date fair value of RSUs settled in period (in dollars per share) \| $ / shares	$ 110.85
Grant date fair value \| $	$ 13.6
Directors
Schedule of Shared-based Compensation Arrangements by Share Based Payment Awards, Activity [Line Items]
Number of awards granted (in shares)	1,256
Grant date fair value \| $	$ 0.1
Grant date fair value of shares granted in period (in dollars per share) \| $ / shares	$ 111.80

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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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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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