SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2013		Mar. 31, 2012		Mar. 31, 2011
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 0.8		$ 0.8		$ 2.4
Charged (Benefit) to Cost and Expenses	0.5		0.1		(0.3)
Charged to Other Accounts	(0.1)	[1]	0	[1]	0.1	[1]
Deductions	0.4	[2]	0.1	[2]	1.4	[2]
Balance at End of Period	0.8		0.8		0.8
Valuation Allowance for Deferred Tax Assets [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	146.8		129.6		121.3
Charged (Benefit) to Cost and Expenses	7.7		1.0		13.9
Charged to Other Accounts	18.3	[1]	16.2	[1]	(5.6)	[1]
Deductions	0		0		0
Balance at End of Period	$ 172.8		$ 146.8		$ 129.6

[1] Translation and other adjustments

[2] Bad debts charged off during the year