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Business Combinations - Schedule of Major Classes of Assets and Liabilities Allocated to Purchase Price (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]      
Goodwill $ 2,031.8 $ 1,973.5 $ 1,927.4
Excelity Global Solutions Pte. Ltd. [Member]      
Business Acquisition [Line Items]      
Cash and equivalents 6.6    
Trade receivables, prepaid expenses, and other current assets 13.0    
Customer trust funds 12.3    
Property, plant, and equipment and other assets 4.2    
Goodwill 42.7    
Other intangible assets, net 20.7    
Accounts payable and other current liabilities (2.2)    
Customer trust funds obligations (13.1)    
Other non-current liabilities (7.0)    
Total purchase price $ 77.2    
RITEQ [Member]      
Business Acquisition [Line Items]      
Cash and equivalents   0.7  
Trade receivables, prepaid expenses, and other current assets   1.3  
Goodwill   16.7  
Other intangible assets, net   4.8  
Other assets   1.0  
Accounts payable and other current liabilities   (0.6)  
Deferred revenue   (1.3)  
Employee compensation and benefits   (1.1)  
Other non-current liabilities   (1.4)  
Total purchase price   $ 20.1