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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
Jun. 30, 2013
Jun. 30, 2012
Derivative Instruments, (Gain) Loss [Line Items]    
Amount of Loss Recognized in AOCI $ 0.4 $ 2.4
Total Loss (Gain) Recognized in Continuing Operations 0 2.3
Reclassification out of Accumulated Other Comprehensive Income [Member]
    
Derivative Instruments, (Gain) Loss [Line Items]    
Loss Reclassified from AOCI into Continuing Operations 0.1 0.8
Foreign Exchange Contract [Member]
    
Derivative Instruments, (Gain) Loss [Line Items]    
Amount of Loss Recognized in AOCI 0 0
Statement of Operations Location Other expense - net Other expense - net
Commodity Derivatives [Member]
    
Derivative Instruments, (Gain) Loss [Line Items]    
Amount of Loss Recognized in AOCI 0.4 2.4
Statement of Operations Location Cost of sales Cost of sales
Cost of Sales [Member] | Commodity Derivatives [Member]
    
Derivative Instruments, (Gain) Loss [Line Items]    
Total Loss (Gain) Recognized in Continuing Operations 0.3 2.7
Cost of Sales [Member] | Commodity Derivatives [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
    
Derivative Instruments, (Gain) Loss [Line Items]    
Loss Reclassified from AOCI into Continuing Operations 0.1 0.8
Other expense - net [Member] | Foreign Exchange Contract [Member]
    
Derivative Instruments, (Gain) Loss [Line Items]    
Total Loss (Gain) Recognized in Continuing Operations (0.3) (0.4)
Other expense - net [Member] | Foreign Exchange Contract [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
    
Derivative Instruments, (Gain) Loss [Line Items]    
Loss Reclassified from AOCI into Continuing Operations $ 0 $ 0