Segments - Revenues by Customer Vertical (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Total net revenues	$ 1,172.3	$ 1,086.3	$ 2,246.7	$ 2,084.3
Cloud
Segment Reporting Information [Line Items]
Total net revenues	320.6	285.5	591.3	547.4
Service Provider
Segment Reporting Information [Line Items]
Total net revenues	443.7	436.2	881.9	811.7
Enterprise
Segment Reporting Information [Line Items]
Total net revenues	$ 408.0	$ 364.6	$ 773.5	$ 725.2