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Acquisitions and Divestitures - Purchase Price Allocation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Cash paid for acquisition of business	$ 128.6	$ 0.0	$ 21.3
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	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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