SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2014		Mar. 31, 2013		Mar. 31, 2012
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 0.8		$ 0.8		$ 0.8
Charged (Benefit) to Cost and Expenses	0.6		0.5		0.1
Charged to Other Accounts	0	[1]	(0.1)	[1]	0	[1]
Deductions	(0.3)	[2]	(0.4)	[2]	(0.1)	[2]
Balance at End of Period	1.1		0.8		0.8
Valuation Allowance for Deferred Tax Assets [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	172.8		146.8		129.6
Charged (Benefit) to Cost and Expenses	(113.1)		7.7		1.0
Charged to Other Accounts	1.5	[1]	18.3	[1]	16.2	[1]
Deductions	0		0		0
Balance at End of Period	$ 61.2		$ 172.8		$ 146.8

[1] Translation and other adjustments

[2] Bad debts charged off during the year