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Acquisitions and Divestitures - Purchase Price Allocation (Details) - USD ($) $ in Millions		12 Months Ended
	Oct. 01, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Cash paid for acquisition of business		$ 37.1	$ 128.6	$ 0.0
Universal Weather and Aviation, Inc.
Business Acquisition [Line Items]
Cash paid for acquisition of business		129.0
Amounts due to sellers		30.0
Purchase price	$ 41.4	159.0
Assets acquired:
Accounts receivable		42.8
Goodwill and identifiable intangible assets		123.3
Other current and long-term assets		3.8
Liabilities assumed:
Accounts payable		(9.9)
Other current and long-term liabilities		(1.0)
Purchase price		$ 159.0

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