Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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Acquisitions - Anasys corp (Details) - USD ($) $ in Millions		12 Months Ended
	Apr. 08, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Acquisitions
Cash paid for acquisitions, net of cash acquired		$ 59.2	$ 90.0	$ 191.6
Anasys
Acquisitions
Ownership percentage acquired	100.00%
Cash paid for acquisitions, net of cash acquired	$ 27.0
Contingent consideration	$ 5.3
Anasys \| Backlog
Acquisitions
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	1 year
Anasys \| Trade name
Acquisitions
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	8 years