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Investments (Equity Method Investments) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Schedule of Equity Method Investments [Line Items]    
Share of results of affiliates, net (note 5) $ 1.7 $ 33.4
Revenue 3,615.3 2,875.8
Earnings (loss) before income taxes 1,610.8 1,097.8
Net earnings 1,440.3 1,017.7
All3Media Group (All3Media)    
Schedule of Equity Method Investments [Line Items]    
Share of results of affiliates, net (note 5) (9.0) (24.9)
Formula E Holdings Ltd (Formula E)    
Schedule of Equity Method Investments [Line Items]    
Share of results of affiliates, net (note 5) 8.7 (1.2)
VodafoneZiggo JV    
Schedule of Equity Method Investments [Line Items]    
Share of results of affiliates, net (note 5) 4.7 61.1
VodafoneZiggo JV | Equity Method Investment, Nonconsolidated Investee or Group of Investees    
Schedule of Equity Method Investments [Line Items]    
Revenue 1,217.0 1,097.1
Earnings (loss) before income taxes (21.4) 124.9
Net earnings (16.1) 99.7
Other    
Schedule of Equity Method Investments [Line Items]    
Share of results of affiliates, net (note 5) $ (2.7) $ (1.6)