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Subsequent Event - Narrative (Details)
$ in Millions, SFr in Billions
Oct. 07, 2020
USD ($)
Oct. 07, 2020
CHF (SFr)
Sep. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Foreign Exchange Contract        
Subsequent Event [Line Items]        
Notional amount of derivative | $     $ 208.0 $ 152.0
Subsequent Event | Foreign Exchange Contract        
Subsequent Event [Line Items]        
Notional amount of derivative | SFr   SFr 4.8    
Subsequent Event | Bisnode        
Subsequent Event [Line Items]        
Estimated purchase price $ 818.0 SFr 7.2    
Proportion of consideration expected in cash (as a percent) 75.00% 75.00%    
Proportion of consideration expected in equity (as a percent) 25.00% 25.00%