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Allowance for Credit Losses (Changes in Allowance for Credit Losses) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
LOANS AND LEASES        
Balance at Beginning of Period $ 148.8 $ 210.2 $ 190.7 $ 104.5
Charge-Offs 0.0 (0.8) (0.4) (3.0)
Recoveries 1.1 1.2 5.6 5.3
Net Recoveries (Charge-Offs) 1.1 0.4 5.2 2.3
Provision for Credit Losses (6.0) 4.8 (52.0) 110.8
Balance at End of Period 143.9 215.4 143.9 215.4
UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT        
Balance at Beginning of Period 46.5 49.0 61.1 19.9
Charge-Offs 0.0 0.0 0.0 0.0
Recoveries 0.0 0.0 0.0 0.0
Net Recoveries (Charge-Offs) 0.0 0.0 0.0 0.0
Provision for Credit Losses (6.7) (4.1) (21.3) 16.1
Balance at End of Period 39.8 44.9 39.8 44.9
HELD TO MATURITY DEBT SECURITIES        
Balance at Beginning of Period 10.5 6.5 7.3 0.0
Charge-Offs 0.0 0.0 0.0 0.0
Recoveries 0.0 0.0 0.0 0.0
Net Recoveries (Charge-Offs) 0.0 0.0 0.0 0.0
Provision for Credit Losses (0.1) 0.4 3.1 0.3
Balance at End of Period 10.4 6.9 10.4 6.9
OTHER FINANCIAL ASSETS        
Balance at Beginning of Period 1.2 1.3 0.8 0.0
Charge-Offs 0.0 0.0 0.0 0.0
Recoveries 0.0 0.0 0.0 0.0
Net Recoveries (Charge-Offs) 0.0 0.0 0.0 0.0
Provision for Credit Losses (0.2) (0.6) 0.2 0.3
Balance at End of Period 1.0 0.7 1.0 0.7
TOTAL        
Balance at Beginning of Period 207.0 267.0 259.9 124.4
Charge-Offs 0.0 (0.8) (0.4) (3.0)
Recoveries 1.1 1.2 5.6 5.3
Net Recoveries (Charge-Offs) 1.1 0.4 5.2 2.3
Provision for Credit Losses (13.0) 0.5 (70.0) 127.5
Balance at End of Period $ 195.1 267.9 195.1 267.9
Cumulative Effect, Period of Adoption, Adjustment        
LOANS AND LEASES        
Balance at Beginning of Period       (2.2)
UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT        
Balance at Beginning of Period       8.9
HELD TO MATURITY DEBT SECURITIES        
Balance at Beginning of Period       6.6
OTHER FINANCIAL ASSETS        
Balance at Beginning of Period       0.4
TOTAL        
Balance at Beginning of Period       13.7
Adjusted Balance        
LOANS AND LEASES        
Balance at Beginning of Period   210.2 190.7 102.3
UNDRAWN LOAN COMMITMENTS AND STANDBY LETTERS OF CREDIT        
Balance at Beginning of Period   $ 49.0 $ 61.1 28.8
HELD TO MATURITY DEBT SECURITIES        
Balance at Beginning of Period       6.6
OTHER FINANCIAL ASSETS        
Balance at Beginning of Period       0.4
TOTAL        
Balance at Beginning of Period       $ 138.1