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Investments and other assets - Narrative (Details)
3 Months Ended 9 Months Ended
Jun. 30, 2020
USD ($)
investment
Mar. 31, 2020
USD ($)
Jun. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Schedule of Equity Method Investments [Line Items]            
Investment balance       $ 30,257,000   $ 27,650,000
Number of investments sold | investment 1          
Proceeds from sale of investments $ 4,300,000          
Gains (losses) on investments     $ 1,600,000 $ 0 $ 0  
CareerBuilder            
Schedule of Equity Method Investments [Line Items]            
Equity method investment retained after disposal, ownership interest (as a percent)       17.00%    
Equity method investment retained after disposal, fully diluted ownership interest (as a percent)       10.00%    
Pre-tax gain on sale of equity method investment   $ 18,600,000        
Investment balance       $ 11,100,000   $ 7,900,000