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Business Combinations and Asset Acquisitions - Summary of Preliminary Allocation of Purchase Price (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Business Acquisition [Line Items]      
Goodwill $ 188.3 $ 119.8 $ 81.4
2021 Acquisitions      
Business Acquisition [Line Items]      
Cash and cash equivalents 11.2    
Other current assets 4.1    
Property and equipment 2.5    
Goodwill 68.5    
Operating lease right-of-use assets 12.8    
Total assets 206.6    
Total liabilities (21.0)    
Net assets 185.6    
2021 Acquisitions | Acquired technology      
Business Acquisition [Line Items]      
Intangible assets 5.5    
2021 Acquisitions | Customer relationships      
Business Acquisition [Line Items]      
Intangible assets 90.7    
2021 Acquisitions | Trademarks      
Business Acquisition [Line Items]      
Intangible assets 11.3    
2020 Acquisitions | Modus Technologies, Inc.      
Business Acquisition [Line Items]      
Cash and cash equivalents 3.0    
Other current assets 0.1    
Property and equipment 0.5    
Goodwill 38.4    
Operating lease right-of-use assets 4.1    
Total assets 55.4    
Total liabilities (5.7)    
Net assets 49.7    
2020 Acquisitions | Other      
Business Acquisition [Line Items]      
Cash and cash equivalents 0.0    
Other current assets 0.0    
Property and equipment 0.0    
Goodwill 0.0    
Operating lease right-of-use assets 0.0    
Total assets 0.9    
Total liabilities 0.0    
Net assets 0.9    
2020 Acquisitions | Acquired technology | Modus Technologies, Inc.      
Business Acquisition [Line Items]      
Intangible assets 6.3    
2020 Acquisitions | Acquired technology | Other      
Business Acquisition [Line Items]      
Intangible assets 0.0    
2020 Acquisitions | Customer relationships | Modus Technologies, Inc.      
Business Acquisition [Line Items]      
Intangible assets 1.3    
2020 Acquisitions | Customer relationships | Other      
Business Acquisition [Line Items]      
Intangible assets 0.9    
2020 Acquisitions | Trademarks | Modus Technologies, Inc.      
Business Acquisition [Line Items]      
Intangible assets 1.7    
2020 Acquisitions | Trademarks | Other      
Business Acquisition [Line Items]      
Intangible assets 0.0    
2019 Acquisitions | Other      
Business Acquisition [Line Items]      
Cash and cash equivalents 2.8    
Other current assets 0.4    
Property and equipment 6.7    
Goodwill 6.2    
Operating lease right-of-use assets 33.7    
Other non-current assets 1.1    
Total assets 58.0    
Total liabilities (36.0)    
Net assets 22.0    
2019 Acquisitions | Contactually, Inc      
Business Acquisition [Line Items]      
Cash and cash equivalents 1.0    
Other current assets 1.0    
Property and equipment 0.0    
Goodwill 21.3    
Operating lease right-of-use assets 1.8    
Other non-current assets 0.3    
Total assets 31.1    
Total liabilities (5.0)    
Net assets 26.1    
2019 Acquisitions | Acquired technology | Other      
Business Acquisition [Line Items]      
Intangible assets 0.0    
2019 Acquisitions | Acquired technology | Contactually, Inc      
Business Acquisition [Line Items]      
Intangible assets 5.7    
2019 Acquisitions | Customer relationships | Other      
Business Acquisition [Line Items]      
Intangible assets 6.5    
2019 Acquisitions | Customer relationships | Contactually, Inc      
Business Acquisition [Line Items]      
Intangible assets 0.0    
2019 Acquisitions | Trademarks | Other      
Business Acquisition [Line Items]      
Intangible assets 0.6    
2019 Acquisitions | Trademarks | Contactually, Inc      
Business Acquisition [Line Items]      
Intangible assets $ 0.0