SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2015		Mar. 31, 2014		Mar. 31, 2013
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 1.1		$ 0.8		$ 0.8
Charged (Benefit) to Costs and Expenses	0.4		0.6		0.5
Charged to Other Accounts	(0.2)	[1]	0	[1]	(0.1)	[1]
Deductions	(0.3)	[2]	(0.3)	[2]	(0.4)	[2]
Balance at End of Period	1.0		1.1		0.8
Valuation Allowance for Deferred Tax Assets [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	61.2		172.8		146.8
Charged (Benefit) to Costs and Expenses	(6.8)		(113.1)		7.7
Charged to Other Accounts	(6.4)	[1]	1.5	[1]	18.3	[1]
Deductions	0		0		0
Balance at End of Period	$ 48.0		$ 61.2		$ 172.8

[1] Translation and other adjustments

[2] Bad debts charged off during the year