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Segment Information (Acquisition of Investment in Films and Television Programs by Segment) (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2015
Segment Reporting Information [Line Items]      
Acquisition of investment in films and television programs and program rights $ 1,092.0 $ 1,066.4 $ 1,012.3
Reportable Segments | Motion Pictures      
Segment Reporting Information [Line Items]      
Acquisition of investment in films and television programs and program rights 412.7 639.9 688.6
Reportable Segments | Television Production      
Segment Reporting Information [Line Items]      
Acquisition of investment in films and television programs and program rights 450.5 426.5 323.7
Reportable Segments | Media Networks      
Segment Reporting Information [Line Items]      
Acquisition of investment in films and television programs and program rights $ 228.8 $ 0.0 $ 0.0