BORROWINGS (Bank) (Narrative) (Details) - Bank - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019
Federal home loan bank advances
Debt Instrument [Line Items]
Debt repurchased	$ 1,000.0
Real estate investment trust
Debt Instrument [Line Items]
Debt repurchased	$ 126.4
Subordinated term loan, due August 2022
Debt Instrument [Line Items]
Debt repurchased		$ 27.9
Real estate investment trust (REIT) preferred
Debt Instrument [Line Items]
Debt repurchased		$ 21.2