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Additional Financial Information (Accumulated Other Comprehensive Income) (Details) - USD ($)
 6 Months Ended
Sep. 30, 2023
Sep. 30, 2022
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance $ 786,000,000.0 $ 2,683,400,000
Ending balance (218,800,000) 847,400,000
Income tax expense (benefit) reflected in other comprehensive income (loss) 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)
Other comprehensive income (loss) (1,400,000) (7,100,000)
Reclassifications to net loss 0 0
Ending balance (23,000,000.0) (26,800,000)
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
Other comprehensive income (loss) 33,300,000 83,000,000.0
Reclassifications to net loss (16,400,000) 17,100,000
Ending balance 159,400,000 149,100,000
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 (100,000) 100,000
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 (16,300,000) 17,000,000
Accumulated other comprehensive income    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance 120,900,000 29,300,000
Other comprehensive income (loss) 31,900,000 75,900,000
Reclassifications to net loss (16,400,000) 17,100,000
Ending balance $ 136,400,000 $ 122,300,000