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Investments (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Schedule of Investments [Line Items]          
Derivative asset, fair value $ 1,300.2   $ 1,300.2   $ 1,827.5
Borrowings outstanding 11,509.3   11,509.3   27,648.1
ITV Collar Loan          
Schedule of Investments [Line Items]          
Borrowings outstanding 949.1   949.1   1,435.5
ITV Collar          
Schedule of Investments [Line Items]          
Derivative asset, fair value 712.5   712.5    
VodafoneZiggo JV          
Schedule of Investments [Line Items]          
Due from related party $ 121.8   $ 121.8    
Percent of interest income earned on loan included in investment 100.00%   100.00%    
Percent of remaining results of operations included in investment 50.00%   50.00%    
VodafoneZiggo JV | Equity Method Investee          
Schedule of Investments [Line Items]          
Revenue from related parties $ 47.2 $ 66.1 $ 135.3 $ 156.1  
Transfer of assets     15.5    
Due from related party 26.4   26.4   19.3
VodafoneZiggo JV Loan | VodafoneZiggo JV          
Schedule of Investments [Line Items]          
Carrying amounts of equity method investments exceeds proportionate share 1,123.0   1,123.0   1,041.0
Due from related party $ 820.5   $ 820.5   $ 786.1
Receivable interest rate     5.55%    
Accrued interests settled in cash     $ 34.4