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Pensions (Tables)
6 Months Ended
Sep. 30, 2020
Pensions [Abstract]  
Pension Cost
Pension cost included the following components:

 
 
Three months ended
September 30,
   
Six months ended
September 30,
 
 
 
2020
   
2019
   
2020
   
2019
 
Service cost
 
$
0.1
   
$
0.1
   
$
0.2
   
$
0.2
 
Interest cost
   
1.9
     
2.2
     
3.9
     
4.5
 
Expected return on plan assets
   
(2.8
)
   
(2.9
)
   
(5.7
)
   
(5.9
)
Amortization of unrecognized net loss
   
1.8
     
1.5
     
3.5
     
3.0
 
Net periodic benefit cost
 
$
1.0
   
$
0.9
   
$
1.9
   
$
1.8