Business Combinations (Tables)

12 Months Ended

Dec. 31, 2020

Business Combinations [Abstract]

Schedule of estimated fair values of assets acquired and liabilities assumed

The following table summarizes the fair values of the assets acquired and liabilities assumed at the acquisition dates (in millions):

	2020				2019
	128 Technology		Netrounds		Mist
Cash and cash equivalents	$	29.1	$	1.0	$	38.9
Goodwill	298.8		24.7		228.9
Intangible assets	116.7		8.7		102.0
Other assets acquired	14.3		0.8		15.8
Liabilities assumed	(10.7)		(1.6)		(26.4)
Total	$	448.2	$	33.6	$	359.2

Summary of fair value of separately identifiable intangible assets acquired

The following table summarizes the fair value of the separately identifiable intangible assets at the time of acquisition and the period over which each intangible asset will be amortized (in millions, except years):

	2020						2019
	128 Technology			Netrounds			Mist
	Weighted Average Estimated Useful Life (In Years)	Amount		Weighted Average Estimated Useful Life (In Years)	Amount		Weighted Average Estimated Useful Life (In Years)	Amount
Intangible assets:
Existing technology	5	$	88.0	4	$	5.3	5	$	81.0
Customer relationships	5	27.0		5	3.4		5	15.0
Trade name	—	—		—	—		5	6.0
Backlog	1.5	1.7		—	—		—	—
Total intangible assets acquired		$	116.7		$	8.7		$	102.0