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Additional Financial Information (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance $ 786,000,000.0 $ 2,683,400,000 $ 2,794,600,000
Ending balance (310,500,000) 786,000,000.0 2,683,400,000
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 (21,600,000) (19,700,000) (15,100,000)
Other comprehensive income (loss) (1,100,000) (1,900,000) (4,600,000)
Reclassifications to net loss 0 0 0
Ending balance (22,700,000) (21,600,000) (19,700,000)
Net unrealized gain (loss) on cash flow hedges      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance 142,500,000 49,000,000.0 (68,200,000)
Other comprehensive income (loss) 30,500,000 82,800,000 68,200,000
Reclassifications to net loss (34,300,000) 10,700,000 49,000,000.0
Ending balance 138,700,000 142,500,000 49,000,000.0
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 300,000 300,000 200,000
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 (34,600,000) 10,400,000 48,800,000
Accumulated other comprehensive income (loss)      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance 120,900,000 29,300,000 (83,300,000)
Other comprehensive income (loss) 29,400,000 80,900,000 63,600,000
Reclassifications to net loss (34,300,000) 10,700,000 49,000,000.0
Ending balance $ 116,000,000.0 $ 120,900,000 $ 29,300,000