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Segment Information - Reconciliation of Revenue from Segments to Consolidated (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Segment Reporting Information [Line Items]    
Revenues $ 373.5 $ 259.2
Operating segments | U.S. Media    
Segment Reporting Information [Line Items]    
Revenues 354.2 245.4
Operating segments | Other    
Segment Reporting Information [Line Items]    
Revenues $ 19.3 $ 13.8