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Pensions (Tables)
 6 Months Ended
Sep. 30, 2019
Pensions [Abstract]  
Pension Cost Pension cost included the following components:

 
  
Three months ended
September 30,
    
Six months ended
September 30,
  
 
  
2019
    
2018
    
2019
    
2018
  
Service cost
  
$
0.1
    
$
0.1
    
$
0.2
    
$
0.2
  
Interest cost
    
2.2
      
2.4
      
4.5
      
4.8
  
Expected return on plan assets
    
(2.9
)
    
(3.1
)
    
(5.9
)
    
(6.1
)
Amortization of unrecognized net loss
    
1.5
      
1.4
      
3.0
      
2.8
  
Net periodic benefit cost
  
$
0.9
    
$
0.8
    
$
1.8
    
$
1.7