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Acquisitions - Summary of Fair Value of Assets Acquired and Liabilities Assumed by Major Class (Details) - USD ($)
$ in Millions
Apr. 30, 2021
Jan. 31, 2021
Business Acquisition [Line Items]    
Goodwill $ 3,484.0 $ 2,706.5
Storm UK Holdco Limited    
Business Acquisition [Line Items]    
Goodwill 767.2  
Deferred revenue and long-term deferred revenue (12.3)  
Long-term deferred income taxes (42.4)  
Net tangible assets 7.3  
Total 1,038.3  
Developed technologies | Storm UK Holdco Limited    
Business Acquisition [Line Items]    
Finite-lived intangibles 93.0  
Customer relationships | Storm UK Holdco Limited    
Business Acquisition [Line Items]    
Finite-lived intangibles 221.0  
Trade name | Storm UK Holdco Limited    
Business Acquisition [Line Items]    
Finite-lived intangibles 4.0  
Backlog | Storm UK Holdco Limited    
Business Acquisition [Line Items]    
Finite-lived intangibles $ 0.5