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Pensions (Tables)
 9 Months Ended
Dec. 31, 2023
Pensions [Abstract]  
Pension Cost
Pension cost included the following components:

  Three months ended December 31,     Nine months ended December 31,  
   
2023
    
2022
    
2023
    
2022
  
Service cost
  
$
-
    
$
0.1
    
$
0.1
    
$
0.2
  
Interest cost
    
2.3
      
2.0
      
7.1
      
6.0
  
Expected return on plan assets
    
(2.5
)
    
(2.9
)
    
(7.7
)
    
(8.7
)
Amortization of unrecognized net loss
    
1.1
      
1.4
      
3.4
      
4.3
  
Net periodic benefit cost
  
$
0.9
    
$
0.6
    
$
2.9
    
$
1.8