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Additional Financial Information (Accumulated Other Comprehensive Income) (Details) - USD ($)
$ in Millions
 9 Months Ended
Dec. 31, 2024
Dec. 31, 2023
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance $ (310.5) $ 786.0
Ending balance (256.1) (323.7)
Income tax expense (benefit) reflected in other comprehensive income (loss) 0.0 0.0
Foreign currency translation adjustments    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance (22.7) (21.6)
Other comprehensive income (loss) (11.3) 1.6
Reclassifications to net loss or noncontrolling interest 5.3 0.0
Ending balance (28.7) (20.0)
Foreign currency translation adjustments | Operating Income (Loss)    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Reclassifications to net loss or noncontrolling interest 0.0  
Net unrealized gain (loss) on cash flow hedges    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance 138.7 142.5
Other comprehensive income (loss) 4.4 17.4
Reclassifications to net loss or noncontrolling interest (16.6) (23.5)
Ending balance 105.1 136.4
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 or noncontrolling interest 1.2 2.5
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 or noncontrolling interest (22.6) (26.0)
Net unrealized gain (loss) on cash flow hedges | Operating Income (Loss)    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Reclassifications to net loss or noncontrolling interest (21.4)  
Accumulated other comprehensive income    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance 116.0 120.9
Other comprehensive income (loss) (6.9) 19.0
Reclassifications to net loss or noncontrolling interest (11.3) (23.5)
Ending balance 76.4 $ 116.4
Accumulated other comprehensive income | Operating Income (Loss)    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Reclassifications to net loss or noncontrolling interest $ (21.4)