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Segment Information - Reconciliation of Assets from Segment to Consolidated (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Segment Reporting Information [Line Items]    
Total assets $ 5,514.0 $ 5,582.9
Operating segments | U.S. Media    
Segment Reporting Information [Line Items]    
Total assets 5,220.7 5,297.2
Operating segments | Other    
Segment Reporting Information [Line Items]    
Total assets [1] 255.8 259.7
Corporate    
Segment Reporting Information [Line Items]    
Total assets $ 37.5 $ 26.0
[1] Includes amounts reclassified as Assets held for sale on the Consolidated Statement of Financial Position.