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Derivatives and Hedging Activities, (Gain) Loss by Hedging Relationship, by Income Statement Location, (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Derivative Instruments, (Gain) Loss [Line Items]        
Amount of Loss Recognized in AOCI     $ 0.7 $ 5.2
Derivative Instruments Loss Reclassification From AOCI into Continuing Operations 0.7 1.3 2.4 1.7
Total Loss (Gain) Recognized in Continuing Operations 0.9 1.0 3.5 1.4
Foreign Exchange Contract [Member]
        
Derivative Instruments, (Gain) Loss [Line Items]        
Amount of Loss Recognized in AOCI     0 0
Commodity Derivatives [Member]
        
Derivative Instruments, (Gain) Loss [Line Items]        
Amount of Loss Recognized in AOCI     0.7 5.2
Location of Loss Reclassified from AOCI into Continuing Operations Cost of sales Cost of sales    
Cost of Sales [Member] | Commodity Derivatives [Member]
        
Derivative Instruments, (Gain) Loss [Line Items]        
Derivative Instruments Loss Reclassification From AOCI into Continuing Operations 0.7 1.3 2.4 1.7
Total Loss (Gain) Recognized in Continuing Operations 1.1 1.3 3.8 1.7
Other expense - net [Member]
        
Derivative Instruments, (Gain) Loss [Line Items]        
Location of Loss Reclassified from AOCI into Continuing Operations Other expense - net Other expense - net    
Other expense - net [Member] | Foreign Exchange Contract [Member]
        
Derivative Instruments, (Gain) Loss [Line Items]        
Derivative Instruments Loss Reclassification From AOCI into Continuing Operations 0 0 0 0
Total Loss (Gain) Recognized in Continuing Operations $ (0.2) $ (0.3) $ (0.3) $ (0.3)