Business Combinations (Tables)

12 Months Ended

Dec. 31, 2019

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):



	2019		2018			2017
	Mist		HTBase			Cyphort
Net tangible assets acquired/(liabilities) assumed	$	28.3	$	(1.0	)	$	1.4
Intangible assets	102.0		7.8			15.4
Goodwill	228.9		14.4			16.7
Total	$	359.2	$	21.2		$	33.5

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):



	2019			2018			2017
	Mist			HTBase			Cyphort
	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	$	81.0	4	$	7.8	5	$	15.4
Customer relationships	5	15.0		—	—		—	—
Trade name	5	6.0		—	—		—	—
Total intangible assets acquired		$	102.0		$	7.8		$	15.4