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Pensions (Tables)
 9 Months Ended
Dec. 31, 2020
Pensions [Abstract]  
Pension Cost
Pension cost included the following components:

  
Three months ended
December 31,
    
Nine months ended
December 31,
  
   
2020
    
2019
    
2020
    
2019
  
Service cost
  
$
0.1
    
$
0.1
    
$
0.3
    
$
0.3
  
Interest cost
    
2.0
      
2.3
      
5.9
      
6.8
  
Expected return on plan assets
    
(2.9
)
    
(3.0
)
    
(8.6
)
    
(8.9
)
Amortization of unrecognized net loss
    
1.7
      
1.5
      
5.2
      
4.5
  
Net periodic benefit cost
  
$
0.9
    
$
0.9
    
$
2.8
    
$
2.7