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Acquisitions and Divestitures - Narrative (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Business Acquisition [Line Items]
Proceeds from sale of business, net of divested cash				$ 268.4	$ 0.0
Provision for income taxes		$ 25.4	$ 21.5	49.0	$ 55.5
Acquisitions
Goodwill	$ 848.2	848.2		848.2		$ 843.7
Universal Weather and Aviation, Inc.
Acquisitions
Goodwill	79.1	79.1		79.1
Goodwill, expected to be tax deductible	70.2	70.2		70.2
Identifiable intangible assets acquired				44.3
Disposal Group, Not Discontinued Operations | Multi Service Payment Solutions
Business Acquisition [Line Items]
Proceeds from sale of business, net of divested cash				303.5
Proceeds from divestiture of businesses, net of cash divested				268.4
Deferred future payment from sale of business	75.0	75.0		75.0
Deferred future payment from sale of business, portion based on future business performance	50.0	$ 50.0		50.0
Gain (loss) on sale of investments	$ 80.0
Provision for income taxes				$ 16.1

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