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Investments (Carrying Amount Of Equity Method Investments) (Details) - USD ($)
$ in Millions
Jun. 30, 2017
May 11, 2017
Mar. 31, 2017
Jun. 30, 2016
Schedule of Equity Method Investments [Line Items]        
Equity method investments $ 131.5   $ 322.9  
EPIX        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership percentage   31.15%   31.15%
Equity method investments [1] $ 0.0   $ 188.8  
Pop        
Schedule of Equity Method Investments [Line Items]        
Equity method investment, ownership percentage 50.00%   50.00%  
Equity method investments $ 96.3   $ 96.8  
Other        
Schedule of Equity Method Investments [Line Items]        
Equity method investments $ 35.2   $ 37.3  
[1] In May 2017, the Company sold all of its 31.15% equity interest in EPIX to MGM (see further details below).