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Additional Financial Information (Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended
Jun. 30, 2022
Jun. 30, 2021
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance $ 2,683.4 $ 2,794.6
Ending balance 2,604.7 2,739.4
Foreign currency translation adjustments    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance (19.7) (15.1)
Other comprehensive loss (3.0) 0.1
Reclassifications to net loss 0.0 0.0
Ending balance (22.7) (15.0)
Net unrealized gain (loss) on cash flow hedges    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance 49.0 (68.2)
Other comprehensive loss 36.3 (36.4)
Reclassifications to net loss 12.6 12.4
Ending balance 97.9 (92.2)
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 0.9 0.3
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 11.7 12.1
Accumulated other comprehensive income (loss)    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance 29.3 (83.3)
Other comprehensive loss 33.3 (36.3)
Reclassifications to net loss 12.6 12.4
Ending balance $ 75.2 $ (107.2)