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Benefit Plans (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
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Feb. 28, 2021 | Feb. 29, 2020 | Feb. 28, 2019
Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Contributions to the plan in current year | $ 4.6 | $ 0.0 |
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year | (3.4) |  |
Expected benefit payments to the plan next fiscal year | 5.7 |  |
Expected benefit payments to the plan year two | 5.7 |  |
Expected benefit payments to the plan year three | 5.7 |  |
Expected benefit payments to the plan year four | 7.0 |  |
Expected benefit payments to the plan year five | 7.0 |  |
Restoration Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected contributions to the plan next year | 0.6 |  |
Expected benefit payments to the plan year two | 0.6 |  |
Expected benefit payments to the plan year three | 0.6 |  |
Expected benefit payments to the plan year four | 0.6 |  |
Expected benefit payments to the plan year five | 0.6 |  |
Retirement Savings Plan401k |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total cost for company contributions | $ 48.5 | $ 47.4 | $ 42.3
Equity securities | Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets target allocation | 75.00% |  |
Fixed income securities | Pension Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan assets target allocation | 25.00% |  |

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