Indebtedness (Senior Credit Facility Narrative) (Details) In Millions, unless otherwise specified		12 Months Ended						12 Months Ended
	Mar. 31, 2014 USD ($)	Mar. 31, 2014 Credit Facility [Member] USD ($)	Mar. 31, 2014 Revolving Credit Borrowings US [Member] USD ($)	Mar. 31, 2014 Revolving Credit Borrowings Multi Currency [Member] USD ($)	Mar. 31, 2014 Revolving Credit Borrowings France [Member] USD ($)	Mar. 31, 2014 Revolving Credit Borrowings France [Member] EUR (€)	Mar. 31, 2014 Maximum [Member] Credit Facility [Member] USD ($)	Mar. 31, 2014 Maximum [Member] Revolving Credit Borrowings US [Member] USD ($)	Mar. 31, 2014 Maximum [Member] Revolving Credit Borrowings Multi Currency [Member] USD ($)
Debt Instrument [Line Items]
Revolving line of credit, maximum borrowing capacity		$ 750.0	$ 650.0	$ 100.0	$ 11.0	€ 8.0
Letters of credit sublimit							65
Debt swingline sublimit							50
Credit facility, expiration date		Jul. 19, 2016	Jul. 19, 2016	Jul. 19, 2016	Jul. 19, 2016	Jul. 19, 2016
Revolving credit facility, maximum increase								325	50
Revolver, outstanding borrowings		54.0	0	54.0	8.1	5.8
Letters of credit outstanding	51
Basis spread on variable rate			1.25%	1.25%	1.25%	1.25%
Debt instrument, interest rate, effective percentage				1.75%	1.47%	1.47%
Credit facility, unused capacity, commitment fee percentage			0.20%	0.20%
Remaining availability under revolving credit facility		$ 257