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Property, Plant and Equipment (Tables)
12 Months Ended
Mar. 31, 2013
Property, Plant and Equipment [Abstract]  
Property, plant and equipment
Property, plant and equipment, including depreciable lives, consisted of the following:
 
March 31
 
2013
  
2012
 
        
Land
 $10.0  $11.8 
Buildings and improvements (10-40 years)
  216.7   249.7 
Machinery and equipment (3-12 years)
  679.1   686.1 
Office equipment (3-10 years)
  95.7   96.0 
Construction in progress
  31.6   49.1 
    1,033.1   1,092.7 
Less: accumulated depreciation
  (677.2)  (680.6)
Net property, plant and equipment
 $355.9  $412.1