Derivative Instruments, (Gain) Loss by Hedging Relationship, by Income Statement Location (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Derivative Instruments, (Gain) Loss [Line Items]
Amount of Loss (Gain) Recognized in AOCI	$ 0	$ 0.5	$ 3.1
Total Loss (Gain) Recognized in Continuing Operations	0.5	4.3	3.4
Reclassification out of Accumulated Other Comprehensive Income [Member]
Derivative Instruments, (Gain) Loss [Line Items]
Loss Reclassified from AOCI into Continuing Operations	0.5	2.6	3.1
Commodity Derivatives [Member]
Derivative Instruments, (Gain) Loss [Line Items]
Amount of Loss (Gain) Recognized in AOCI	0	0.5	3.1
Foreign Exchange Contracts [Member]
Derivative Instruments, (Gain) Loss [Line Items]
Amount of Loss (Gain) Recognized in AOCI		0	0
Cost of Sales [Member] | Commodity Derivatives [Member]
Derivative Instruments, (Gain) Loss [Line Items]
Total Loss (Gain) Recognized in Continuing Operations	0.5	4.6	3.0
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	0.5	2.6	3.1
Other Expense - net [Member] | Foreign Exchange Contracts [Member]
Derivative Instruments, (Gain) Loss [Line Items]
Total Loss (Gain) Recognized in Continuing Operations		(0.3)	0.4
Other Expense - net [Member] | Foreign Exchange Contracts [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Derivative Instruments, (Gain) Loss [Line Items]
Loss Reclassified from AOCI into Continuing Operations		$ 0	$ 0