Segments - Revenue by Product (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($) segment	Mar. 31, 2020 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment	1
Total net revenues	$ 1,074.4	$ 998.0
Automated WAN Solutions
Segment Reporting Information [Line Items]
Total net revenues	386.4	315.5
Cloud-Ready Data Center
Segment Reporting Information [Line Items]
Total net revenues	157.4	174.4
AI-Driven Enterprise
Segment Reporting Information [Line Items]
Total net revenues	161.2	143.4
Hardware Maintenance and Professional Services
Segment Reporting Information [Line Items]
Total net revenues	$ 369.4	$ 364.7