Derivative Instruments, (Gain) Loss by Hedging Relationship, by Income Statement Location (Details) - USD ($) $ in Millions		12 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Derivative Instruments, (Gain) Loss [Line Items]
Reclassified gains from foreign exchange contracts to net sales	[1]	$ 0.1
Non-Designated Derivative [Member]
Derivative Instruments, (Gain) Loss [Line Items]
Total gains (losses)		(0.2)	$ 1.8	$ (0.1)
Commodity Derivatives [Member] | Other Comprehensive Income (Loss) [Member] | Designated [Member]
Derivative Instruments, (Gain) Loss [Line Items]
Total gains (losses)		0.2
Commodity Derivatives [Member] | Cost of Sales [Member] | Non-Designated Derivative [Member]
Derivative Instruments, (Gain) Loss [Line Items]
Total gains (losses)		0.4	0.5	(0.7)
Foreign Exchange Contracts [Member] | Other Comprehensive Income (Loss) [Member] | Designated [Member]
Derivative Instruments, (Gain) Loss [Line Items]
Total gains (losses)		0.1
Foreign Exchange Contracts [Member] | Net Sales [Member] | Non-Designated Derivative [Member]
Derivative Instruments, (Gain) Loss [Line Items]
Total gains (losses)		(0.1)	0.0	0.0
Foreign Exchange Contracts [Member] | Other Income (Expense) - Net [Member] | Non-Designated Derivative [Member]
Derivative Instruments, (Gain) Loss [Line Items]
Total gains (losses)		$ (0.5)	$ 1.3	$ 0.6

[1] Amounts reclassified to net earnings. See Note 17 for additional information regarding derivative instruments.