Indebtedness (Senior Credit Facility Narrative) (Details) In Millions, unless otherwise specified	9 Months Ended					9 Months Ended			9 Months Ended
	Dec. 31, 2011	Dec. 31, 2011 Revolving Credit Borrowings- U.S. [Member] USD ($)	Dec. 31, 2011 Revolving Credit Borrowings- Multi-Currency [Member] USD ($)	Dec. 31, 2011 Revolving Credit Borrowings- France [Member] USD ($)	Dec. 31, 2011 Revolving Credit Borrowings- France [Member] EUR (€)	Dec. 31, 2011 Credit Facility [Member] USD ($)	Dec. 31, 2011 Revolving Credit Borrowings- U.S. [Member] USD ($)	Dec. 31, 2011 Credit Facility [Member] Letters of Credit [Member] USD ($)	Dec. 31, 2011 Revolving Credit Borrowings- Multi-Currency [Member] USD ($)
Debt Instrument [Line Items]
Amended and restated credit facility	July 19, 2011
Revolving line of credit, maximum borrowing capacity		$ 650.0	$ 100.0	$ 10.4	€ 8.0	$ 750.0
Line of credit facility, expiration date	September 13, 2010
Maturity date						Jul. 19, 2016
Revolving credit facility, maximum increase							325		50
Outstanding borrowings				6.2	4.8	41.0
Letters of credit outstanding amount								45
Basis points		1.25%	1.25%	1.25%	1.25%
Debt Instrument, Interest Rate, Effective Percentage			2.15%	2.38%	2.38%
Unused portion of revolving credit facility						$ 257