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Additional Financial Information (Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Millions
 6 Months Ended
Sep. 30, 2021
Sep. 30, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance $ 2,794.6 $ 2,660.0
Ending balance 2,750.4 2,714.3
Foreign currency translation adjustments    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance (15.1) (18.8)
Other comprehensive loss (1.0) 0.8
Reclassifications to net loss 0.0 0.0
Ending balance (16.1) (18.0)
Net unrealized gain (loss) on cash flow hedges    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance (68.2) (187.2)
Other comprehensive loss (38.7) (28.8)
Reclassifications to net loss 33.8 28.5
Ending balance (73.1) (187.5)
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 0.4 0.1
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 33.4 28.4
Accumulated other comprehensive loss    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance (83.3) (206.0)
Other comprehensive loss (39.7) (28.0)
Reclassifications to net loss 33.8 28.5
Ending balance $ (89.2) $ (205.5)