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Junior Subordinated Debentures Held by Trust Subsidiaries - Narrative (Details)
$ in Millions
3 Months Ended 12 Months Ended
Jan. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2021
payment
subsidiary
Dec. 31, 2020
payment
Debt Instrument [Line Items]        
Number of trust subsidiaries | subsidiary     5  
Trust Redemption        
Debt Instrument [Line Items]        
Decrease in cash and cash equivalents   $ 27.1    
Decrease in financing liabilities   28.1    
Decrease in other assets   3.4    
Decrease in other liabilities   2.2    
Unamortized issuance costs   0.3    
Decrease in Company’s Tier 1 equity capital   $ 24.7    
Junior Subordinated Debt        
Debt Instrument [Line Items]        
Period of deferred payments of interest     5 years  
Number of interest payments deferred | payment     0 0
8.90% Trust Preferred Securities        
Debt Instrument [Line Items]        
Preferred stock, redemption amount $ 26.8      
Interest rate, stated percentage 8.90%      
Contractual call price 100.00%