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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Expense Benefit [Line Items]      
Interest expense, domestic deposits $ 24.0 $ 40.1 $ 65.8
Net unrecognized tax benefits 9.5 9.4  
Accrued interest and penalties related to unrecognized tax benefits $ 3.0 3.1  
Open tax year 2011 2012    
Deferred tax liabilities $ 495.1 490.8  
Net operating loss carryforwards $ 36.1 37.2  
Net operating loss carryforward expiration year 2023    
Undistributed earnings of foreign subsidiaries $ 658.9 574.0  
Deferred income taxes 1,085.8 945.6  
Deferred tax assets included due to deferral of payroll taxes 12.9    
State Tax Credits [Member]      
Income Tax Expense Benefit [Line Items]      
Deferred tax credits $ 15.0    
Deferred tax credits expiration year 2025    
HR One [Member]      
Income Tax Expense Benefit [Line Items]      
Deferred income taxes     $ 2.9
General Business and Other Tax Credits [Member]      
Income Tax Expense Benefit [Line Items]      
Deferred tax credits $ 983.0    
Deferred tax credits expiration year 2034    
Noncurrent Liabilities [Member]      
Income Tax Expense Benefit [Line Items]      
Deferred tax liabilities $ 106.9 $ 127.5