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Capital Stock (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Feb. 01, 2022
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
May 25, 2022
Dec. 31, 2021
Sep. 12, 2020
Class of Stock [Line Items]                
Shares outstanding (in shares)   107,758,038   107,758,038     62,200,456  
Common shares issued (in shares)   26,266 18,477 46,913,370 19,081      
Stock Repurchase Program, Number of Shares Authorized to be Repurchased               5,000,000
Stock repurchased and retired (in shares)   1,722,044 284 1,759,742 127,464      
Stock Repurchased and Retired During Period, Value   $ 64.5 $ 0.0 $ 65.9 $ 5.4      
Shares repurchased, average cost per share (in dollars per share)       $ 37.38        
Shares repurchased during the period as percentage of shares authorized for repurchase (percent)       34.40%        
Accelerated Share Repurchases, Adjustment to Recorded Amount       $ 64.3        
Great Western Bank                
Class of Stock [Line Items]                
Total consideration exchanged $ 1,723.3              
Class A Common Stock                
Class of Stock [Line Items]                
Shares outstanding (in shares)             41,699,409  
Stock Repurchase Program, Number of Shares Authorized to be Repurchased           5,000,000    
Stock repurchased and retired (in shares)   1,720,700            
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased   3,300,000   3,300,000   1,889,158    
Class A Common Stock | Great Western Bank                
Class of Stock [Line Items]                
Number of shares issued as consideration (in shares) 46,879,601              
Class B Common Stock                
Class of Stock [Line Items]                
Shares outstanding (in shares)             20,501,047  
Director [Member]                
Class of Stock [Line Items]                
Common shares issued (in shares)       33,769 19,081