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Property, Plant and Equipment (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Property, Plant and Equipment [Line Items]      
Gross property, plant and equipment $ 1,033.1 $ 1,092.7  
Less accumulated depreciation (677.2) (680.6)  
Net property, plant and equipment 355.9 412.1  
Depreciation expense 55.1 57.1 55.8
(Loss) gain from disposition of property, plant and equipment (2.5) (0.6) 3.4
Land [Member]
     
Property, Plant and Equipment [Line Items]      
Gross property, plant and equipment 10.0 11.8  
Buildings and Improvements [Member]
     
Property, Plant and Equipment [Line Items]      
Gross property, plant and equipment 216.7 249.7  
Buildings and Improvements [Member] | Minimum [Member]
     
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, depreciable lives 10 years    
Buildings and Improvements [Member] | Maximum [Member]
     
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, depreciable lives 40 years    
Machinery and Equipment [Member]
     
Property, Plant and Equipment [Line Items]      
Gross property, plant and equipment 679.1 686.1  
Machinery and Equipment [Member] | Minimum [Member]
     
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, depreciable lives 3 years    
Machinery and Equipment [Member] | Maximum [Member]
     
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, depreciable lives 12 years    
Office Equipment [Member]
     
Property, Plant and Equipment [Line Items]      
Gross property, plant and equipment 95.7 96.0  
Office Equipment [Member] | Minimum [Member]
     
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, depreciable lives 3 years    
Office Equipment [Member] | Maximum [Member]
     
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, depreciable lives 10 years    
Construction in Progress [Member]
     
Property, Plant and Equipment [Line Items]      
Gross property, plant and equipment $ 31.6 $ 49.1