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Property, Plant and Equipment (Tables)
 12 Months Ended
Mar. 31, 2018
Property, Plant and Equipment [Abstract]  
Property, plant and equipment
Property, plant and equipment, including depreciable lives, consisted of the following:

  
March 31,
 
  
2018
  
2017
 
Land
 
$
22.6
  
$
18.9
 
Buildings and improvements (10-40 years)
  
295.6
   
255.6
 
Machinery and equipment (3-12 years)
  
840.8
   
755.5
 
Office equipment (3-10 years)
  
93.0
   
92.5
 
Construction in progress
  
50.2
   
55.1
 
   
1,302.2
   
1,177.6
 
Less: accumulated depreciation
  
(797.9
)
  
(718.6
)
Net property, plant and equipment
 
$
504.3
  
$
459.0