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Additional Financial Information (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance $ 2,683,400,000 $ 2,794,600,000 $ 2,660,000,000
Ending balance 786,000,000.0 2,683,400,000 2,794,600,000
Income tax expense (benefit) reflected in other comprehensive income (loss) 0 0 0
Foreign currency translation adjustments      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (19,700,000) (15,100,000) (18,800,000)
Other comprehensive income (loss) (1,900,000) (4,600,000) 3,700,000
Reclassifications to net loss 0 0 0
Ending balance (21,600,000) (19,700,000) (15,100,000)
Net unrealized gain (loss) on cash flow hedges      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance 49,000,000.0 (68,200,000) (187,200,000)
Other comprehensive income (loss) 82,800,000 68,200,000 70,900,000
Reclassifications to net loss 10,700,000 49,000,000.0 48,100,000
Ending balance 142,500,000 49,000,000.0 (68,200,000)
Net unrealized gain (loss) on cash flow hedges | Direct Operating Expense      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Reclassifications to net loss 300,000 200,000 (200,000)
Net unrealized gain (loss) on cash flow hedges | Interest Expense      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Reclassifications to net loss 10,400,000 48,800,000 48,300,000
Accumulated other comprehensive income (loss)      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance 29,300,000 (83,300,000) (206,000,000.0)
Other comprehensive income (loss) 80,900,000 63,600,000 74,600,000
Reclassifications to net loss 10,700,000 49,000,000.0 48,100,000
Ending balance $ 120,900,000 $ 29,300,000 $ (83,300,000)