Acquisitions and Dispositions - Narrative (Details) - USD ($) $ in Millions			1 Months Ended	3 Months Ended			6 Months Ended	9 Months Ended
	Apr. 01, 2022	Jan. 01, 2022	Apr. 30, 2023	Sep. 30, 2023	Sep. 30, 2022	Mar. 31, 2022	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Business Acquisition [Line Items]
Impairment charge					$ 27.7				$ 27.7
Transitional Services Agreement
Business Acquisition [Line Items]
Expenses recognized						$ 7.0
MoPub
Business Acquisition [Line Items]
Consideration paid		$ 1,030.0
Acquisition-related expense		14.4
Expected tax deductible amount for goodwill		645.1
Liabilities assumed in transaction		$ 0.0
Wurl, Inc.
Business Acquisition [Line Items]
Consideration paid	$ 219.3
Acquisition-related expense	1.9
Consideration transferred	378.2
Business combination, equity interests issued and issuable	137.4
Consideration transferred, liabilities incurred	$ 22.7
Transferred indemnity holdback period	18 months
Revenue of acquiree since acquisition date									22.7
Pretax loss of acquiree since acquisition date							$ 8.7
Wurl, Inc. | Portion at Other than Fair Value Measurement
Business Acquisition [Line Items]
Consideration transferred, liabilities incurred	$ 21.5
Wurl, Inc. | Class A Common Stock
Business Acquisition [Line Items]
Interests issued and issuable shares	2,579,692		90,000,000
Business combination, consideration transferred, cash and equity interests issued and issuable, earnout			$ 600.0
Certain Mobile Game Apps
Business Acquisition [Line Items]
Contingent consideration, costs				$ 9.2				$ 52.2
Asset acquisition, consideration transferred, contingent consideration, earn-out payment					$ 23.2				$ 98.7