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Additional Financial Information (Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance $ 2,714.3 $ 2,842.3 $ 2,660.0 $ 2,921.9
Other comprehensive loss 35.4 22.1 35.9 (43.2)
Ending balance 2,747.1 2,796.3 2,747.1 2,796.3
Foreign currency translation adjustments        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance     (18.8)  
Other comprehensive loss     5.6  
Ending balance (13.2)   (13.2)  
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     30.3  
Ending balance (156.9)   (156.9)  
Accumulated other comprehensive loss        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance (205.5) (145.6) (206.0) (80.3)
Other comprehensive loss 35.4 22.1 35.9 (43.2)
Ending balance $ (170.1) $ (123.5) $ (170.1) $ (123.5)