Derivative Financial Instruments and Hedging Activities (Cash Flow Hedges) (Details) - Cash flow hedging	May 31, 2020 USD ($)
Anticipated Debt Issuance | Interest rate swaps
Derivative [Line Items]
Aggregate notional amount	$ 200,000,000.0
Debt obligations | Interest rate swaps
Derivative [Line Items]
Aggregate notional amount	550,000,000.0
Debt obligations | Interest Rate Swap Expiration August 24, 2020
Derivative [Line Items]
Aggregate notional amount	350,000,000.0
Debt obligations | Interest Rate Swap Expiring August 31, 2020
Derivative [Line Items]
Aggregate notional amount	$ 200,000,000.0