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Segment Information (Gain on Sale of Pantaya, Adjusted Depreciation and Amortization, Programming and Content Charges, COVID-19 Charges) (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Goodwill allocated related to sale of Pantaya $ 69.0    
Depreciation and amortization 188.5 $ 197.7 $ 163.4
Adjusted depreciation and amortization 44.3 41.8 41.1
COVID-19 related charges 67.5 50.2  
Corporate and reconciling items      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Adjusted depreciation and amortization 44.3 41.8 41.1
COVID-19 related charges 67.5 50.2 0.0
Programming and content charges 0.0 76.5 35.1
Purchase accounting and related adjustments | Corporate and reconciling items      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Depreciation and amortization $ (144.2) $ (155.9) $ (122.3)