Segment Information - Revenue and Long-Lived Assets By Geography (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Segment Reporting [Line Items]
Revenues		$ 429.6	$ 390.7
United States
Segment Reporting [Line Items]
Revenues	[1]	429.6	$ 390.7
Long-Lived Asset, Excluding Financial Instrument, Customer Relationship, Mortgage Servicing Right, Deferred Policy Acquisition Cost, and Deferred Tax Asset, Amount	[2]	$ 4,823.9		$ 4,798.8

[1] Revenues classifications are based on the geography of the advertising.

[2] Reflects total assets less current assets, investments and non-current deferred tax assets.