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Business Combinations - Estimated Fair Value of Assets Acquired (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Jan. 27, 2021
Dec. 31, 2020
Business Acquisition [Line Items]      
Goodwill $ 3,753.3   $ 3,669.6
Apstra      
Business Acquisition [Line Items]      
Cash and cash equivalents   $ 1.8  
Goodwill   84.0  
Intangible assets   87.8  
Other assets acquired   12.6  
Liabilities assumed   (6.8)  
Total   $ 179.4