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Additional Financial Information (Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance $ 2,794.6 $ 2,660.0 $ 2,921.9
Ending balance 2,683.4 2,794.6 2,660.0
Foreign currency translation adjustments      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (15.1) (18.8) (18.2)
Other comprehensive income (loss) (4.6) 3.7 (0.6)
Reclassifications to net loss 0.0 0.0 0.0
Ending balance (19.7) (15.1) (18.8)
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) (62.1)
Other comprehensive income (loss) 68.2 70.9 (137.8)
Reclassifications to net loss 49.0 48.1 12.7
Ending balance 49.0 (68.2) (187.2)
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 0.2 (0.2) (1.6)
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 48.8 48.3 14.3
Accumulated other comprehensive income (loss)      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (83.3) (206.0) (80.3)
Other comprehensive income (loss) 63.6 74.6 (138.4)
Reclassifications to net loss 49.0 48.1 12.7
Ending balance $ 29.3 $ (83.3) $ (206.0)