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Additional Financial Information (Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended
Jun. 30, 2020
Jun. 30, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance $ 2,660.0 $ 2,921.9
Other comprehensive loss (6.6) (45.0)
Ending balance 2,709.5 2,855.0
Foreign currency translation adjustments    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance (18.8)  
Other comprehensive loss 0.4  
Ending balance (18.4)  
Net unrealized gain (loss) on cash flow hedges    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance (187.2)  
Other comprehensive loss (7.0)  
Ending balance (194.2)  
Accumulated other comprehensive loss    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning balance (206.0) (80.3)
Other comprehensive loss (6.6) (45.0)
Ending balance $ (212.6) $ (125.3)