Derivative Instruments, (Gain) Loss by Hedging Relationship, by CI and Income Statement (Details) - USD ($) $ in Millions		12 Months Ended
		Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Derivative Instruments, (Gain) Loss [Line Items]
Gain (loss) reclassified from AOCI	[1]	$ (0.5)	$ (0.2)
Designated [Member]
Derivative Instruments, (Gain) Loss [Line Items]
Gain (loss) reclassified from AOCI		(0.5)	(0.2)	$ 0.1
Non-Designated Derivative [Member]
Derivative Instruments, (Gain) Loss [Line Items]
Total gains (losses)		(0.2)	(1.0)	(0.2)
Other Comprehensive Income [Member] | Designated [Member]
Derivative Instruments, (Gain) Loss [Line Items]
Total gains (losses)		(2.5)	0.3	0.3
Commodity Derivatives [Member] | Cost of Sales [Member] | Designated [Member]
Derivative Instruments, (Gain) Loss [Line Items]
Gain (loss) reclassified from AOCI		(0.8)	(0.4)	0.0
Commodity Derivatives [Member] | Cost of Sales [Member] | Non-Designated Derivative [Member]
Derivative Instruments, (Gain) Loss [Line Items]
Total gains (losses)		0.0	0.0	0.4
Commodity Derivatives [Member] | Cost of Sales [Member] | Other Comprehensive Income [Member] | Designated [Member]
Derivative Instruments, (Gain) Loss [Line Items]
Total gains (losses)		(2.6)	(0.3)	0.2
Foreign Exchange Contracts [Member] | Cost of Sales [Member] | Designated [Member]
Derivative Instruments, (Gain) Loss [Line Items]
Gain (loss) reclassified from AOCI		0.4	0.6	0.0
Foreign Exchange Contracts [Member] | Cost of Sales [Member] | Other Comprehensive Income [Member] | Designated [Member]
Derivative Instruments, (Gain) Loss [Line Items]
Total gains (losses)		0.2	1.0	0.0
Foreign Exchange Contracts [Member] | Net Sales [Member] | Designated [Member]
Derivative Instruments, (Gain) Loss [Line Items]
Gain (loss) reclassified from AOCI		(0.1)	(0.4)	0.1
Foreign Exchange Contracts [Member] | Net Sales [Member] | Non-Designated Derivative [Member]
Derivative Instruments, (Gain) Loss [Line Items]
Total gains (losses)		(0.1)	(0.7)	(0.1)
Foreign Exchange Contracts [Member] | Net Sales [Member] | Other Comprehensive Income [Member] | Designated [Member]
Derivative Instruments, (Gain) Loss [Line Items]
Total gains (losses)		(0.1)	(0.4)	0.1
Foreign Exchange Contracts [Member] | Other Income (Expense) - Net [Member] | Non-Designated Derivative [Member]
Derivative Instruments, (Gain) Loss [Line Items]
Total gains (losses)		$ (0.1)	$ (0.3)	$ (0.5)

[1] Amounts represent net gains and losses associated with cash flow hedges that were reclassified to net earnings.  See Note 19 for additional information regarding derivative instruments.