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Derivative Instruments and Hedging Activities - Narrative (Details) - USD ($)
3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2020
Derivative [Line Items]      
Pre-tax net losses associated with interest rate hedges $ 4,000,000    
Pre-tax losses associated with net investment hedges 32,000,000 $ 20,000,000  
Interest Rate Protection Agreements      
Derivative [Line Items]      
Notional amount $ 0 $ 0 $ 0
Foreign Exchange Forward      
Derivative [Line Items]      
Derivative notional amount percent of required need coverage 90.00%