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Segment Information - Reconciliation of Revenue from Segments to Consolidated (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Segment Reporting Information [Line Items]        
Revenues $ 454.8 $ 453.7 $ 1,319.4 $ 1,277.4
Operating segments | U.S. Media        
Segment Reporting Information [Line Items]        
Revenues 428.7 428.0 1,248.1 1,204.7
Operating segments | Other        
Segment Reporting Information [Line Items]        
Revenues $ 26.1 $ 25.7 $ 71.3 $ 72.7