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Commitments and Contingencies - Additional Information (Detail) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 12 Months Ended 36 Months Ended
Nov. 30, 2018
Mar. 31, 2016
Dec. 31, 2020
Dec. 31, 2016
Dec. 31, 2014
Dec. 31, 2009
Dec. 31, 2019
Nov. 08, 2018
Commitments and Contingencies [Line Items]                
Loss contingency accrual     $ 57.0       $ 57.5  
Term Credit Facility                
Commitments and Contingencies [Line Items]                
Debt instrument, face amount     0.0          
Debt instrument, face amount     0.0          
Internal Revenue Service (IRS)                
Commitments and Contingencies [Line Items]                
Deductions on securities losses           $ 900.0    
Tax adjustments   $ 63.7     $ 186.9      
Income Taxes Paid       $ 61.0        
Deferred Prosecution Agreement                
Commitments and Contingencies [Line Items]                
Effect on future cash flows     $ 55.0          
Loss contingency accrual               $ 125.0
Payments for legal settlements $ 70.0