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Share-based Compensation and Other Employment Benefit Plans - Narrative (Details)
$ in Millions
12 Months Ended
Jan. 01, 2019
shares
Dec. 31, 2021
USD ($)
simulation
shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   3 years    
Award requisite service period   3 years    
Tax benefit recognized from compensation expense   $ 7.0 $ 4.8 $ 6.3
Unrecognized compensation cost   $ 30.3    
Unrecognized compensation cost, period of recognition (years)   1 year 10 months 13 days    
Stock option grants (in shares) | shares   0 0 0
Assumed in acquisition (in shares) | shares   0 0 3,230,000
Options outstanding, intrinsic value   $ 37.2    
Options outstanding, weighted average remaining contractual term (years)   2 years 6 months 3 days    
Options exercised, intrinsic value   $ 21.3 $ 5.3 $ 13.6
Performance period   3 years    
FCB Financial Holdings, Inc.        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Assumed in acquisition (in shares) | shares 3,200,000      
Market/Performance Share Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of simulations | simulation   100,000    
Non-option awards vested, total fair value   $ 2.4 7.9 5.7
Performance Share Units (PSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   3 years    
Percentage of awards subject to market condition   50.00%    
Percentage of awards subject to ROATCE   50.00%    
vesting        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   3 years    
performance period        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   3 years    
ROAA and ROATCE        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   3 years    
Restricted Share Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Non-option awards vested, total fair value   $ 19.8 $ 13.4 $ 11.2
Minimum | Market/Performance Share Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting range based on return on average assets (ROAA)   75.00%    
Minimum | Performance Share Units (PSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options, vested and expected to vest, range based on return on average assets   0.00%    
Maximum | Market/Performance Share Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting range based on return on average assets (ROAA)   125.00%    
Maximum | Performance Share Units (PSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Options, vested and expected to vest, range based on return on average assets   150.00%    
2021 Omnibus Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares of authorized but unissued common stock reserved for future grants (in shares) | shares   5,800,000