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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Segment Reporting Information [Line Items]        
Revenues $ 462.5 $ 414.2 $ 1,294.1 $ 1,153.8
Operating segments | U.S. Media        
Segment Reporting Information [Line Items]        
Revenues 422.7 379.7 1,180.7 1,056.8
Operating segments | Other        
Segment Reporting Information [Line Items]        
Revenues $ 39.8 $ 34.5 $ 113.4 $ 97.0