v3.10.0.1
Derivative Instruments (Realized and Unrealized Gains (Losses) on Derivatives) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Derivative [Line Items]      
Gain (loss) on derivative instruments, net $ 1,125.8 $ (1,052.8) $ 1,022.3
Cross Currency Interest Rate Contract      
Derivative [Line Items]      
Gain (loss) on derivative instruments, net 905.8 (1,145.6) 668.5
ITV Collar      
Derivative [Line Items]      
Gain (loss) on derivative instruments, net 176.7 215.0 351.5
Sumitomo Collar      
Derivative [Line Items]      
Gain (loss) on derivative instruments, net (11.8) (77.4) (25.6)
Lionsgate Forward      
Derivative [Line Items]      
Gain (loss) on derivative instruments, net 30.1 (11.4) 10.1
Other Equity Related Derivative Instrument      
Derivative [Line Items]      
Gain (loss) on derivative instruments, net 2.5 (3.9) 1.6
Equity-related derivative instruments      
Derivative [Line Items]      
Gain (loss) on derivative instruments, net 197.5 122.3 337.6
Foreign Exchange Contract      
Derivative [Line Items]      
Gain (loss) on derivative instruments, net 22.7 (30.2) 17.0
Other Contract      
Derivative [Line Items]      
Gain (loss) on derivative instruments, net $ (0.2) $ 0.7 $ (0.8)