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Investments (Gain (Loss) on Investments) (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Mar. 15, 2019
May 31, 2017
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Schedule of Equity Method Investments [Line Items]          
Impairments of investments     $ (36.8) $ (29.2) $ 0.0
Unrealized losses on equity securities held at reporting date     (6.2) 0.0 0.0
Gain (loss) on sale of equity method investees     (44.6) 201.0 0.0
Gain on Starz investment     0.0 0.0 20.4
Gain (loss) on investments     (87.6) 171.8 $ 20.4
Equity Securities without readily determinable fair value, impairments     34.2    
Disposed by sale | Pop          
Schedule of Equity Method Investments [Line Items]          
Ownership interest sold 50.00%        
Gain (loss) on sale of equity method investees     $ (44.6)    
Disposed by sale | EPIX          
Schedule of Equity Method Investments [Line Items]          
Ownership interest sold   31.15%      
Gain (loss) on sale of equity method investees       $ 201.0