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Additional Financial Information (Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2021
Jun. 30, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance $ 2,794.6 $ 2,660.0
Other comprehensive loss (23.9) (6.6)
Ending balance 2,739.4 2,709.5
Foreign currency translation adjustments    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance (15.1)  
Other comprehensive loss 0.1  
Ending balance (15.0)  
Net unrealized gain (loss) on cash flow hedges    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance (68.2)  
Other comprehensive loss (24.0)  
Ending balance (92.2)  
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 (23.9) (6.6)
Ending balance $ (107.2) $ (212.6)