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ALLOWANCE FOR CREDIT LOSSES ON LOANS AND LEASES - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jan. 01, 2020
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Stockholders' equity attributable to parent   $ 5,037.0 $ 4,897.0 $ 5,037.0 $ 4,897.0 $ 4,959.0 $ 4,974.0 $ 4,842.0 $ 4,883.0
Financing receivable, allowance for credit loss, period increase (decrease) $ 105.0         (6.6)      
Allowance for credit loss   $ 357.0   $ 357.0   $ 363.0 362.0    
Percentage of growth, gross domestic product           4.00%      
Percentage of unemployment   4.00%   4.00%   6.00%      
Percentage of contraction, gross domestic product, current year   8.00%   8.00%          
Percentage of contraction, gross domestic product, next fiscal year   3.00%   3.00%          
Financing receivable, allowance for credit loss, period increase (decrease), percentage           (1.80%)      
Financing receivable, allowance for credit loss, ratio   1.42%   1.42%   1.43%      
Provision for credit losses   $ 1.1   $ 4.8          
Financing receivable, allowance for credit loss, write-off, after recovery   (3.8) (8.5) (11.0) (14.2)        
Allowance For Credit Losses on Loans and Leases [Member]                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Allowance for credit loss   356.5 365.0 356.5 365.0 $ 363.0   343.0 196.0
Financing receivable, allowance for credit loss, write-off, after recovery     (8.0) (11.0) (14.0)        
Impact of ASC 326 Adoption [Member]                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Stockholders' equity attributable to parent                 (50.0)
Retained Earnings [Member]                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Stockholders' equity attributable to parent   $ 981.0 $ 796.0 $ 981.0 $ 796.0 $ 869.0 $ 921.0 $ 754.0 798.0
Retained Earnings [Member] | Impact of ASC 326 Adoption [Member]                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Stockholders' equity attributable to parent                 $ (50.0)
Accounting Standards Update 2016-13 [Member] | Retained Earnings [Member] | Impact of ASC 326 Adoption [Member]                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Stockholders' equity attributable to parent (50.6)                
Longer Duration Loans and Gross Up [Member] | Accounting Standards Update 2016-13 [Member]                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Financing receivable, allowance for credit loss, period increase (decrease) 50.0                
Unfunded Loan Commitment [Member] | Accounting Standards Update 2016-13 [Member]                  
Financing Receivable, Allowance for Credit Loss [Line Items]                  
Allowance for credit loss $ 10.0