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Significant Accounting Policies (Tables)
 12 Months Ended
Mar. 31, 2021
Significant Accounting Policies [Abstract]  
Supplemental Cash Flow Information
Supplemental Cash Flow Information

  
Years ended March 31,
  
   
2021
    
2020
    
2019
  
Interest paid
  
$
17.9
    
$
21.4
    
$
22.3
  
Income taxes paid
    
19.7
      
18.8
      
22.2