Financial Instruments (Details 4) (USD $) In Millions	Sep. 30, 2011	Mar. 31, 2011	Sep. 30, 2011 Euro [Member]	Mar. 31, 2011 Euro [Member]	Sep. 30, 2011 Australian dollar [Member]	Mar. 31, 2011 Australian dollar [Member]	Sep. 30, 2011 British Pound [Member]	Mar. 31, 2011 British Pound [Member]	Sep. 30, 2011 Chinese yuan renminbi [Member]	Mar. 31, 2011 Chinese yuan renminbi [Member]	Sep. 30, 2011 New Zealand dollar [Member]	Mar. 31, 2011 New Zealand dollar [Member]	Sep. 30, 2011 Swiss franc [Member]	Mar. 31, 2011 Swiss franc [Member]	Sep. 30, 2011 Danish krone [Member]	Mar. 31, 2011 Danish krone [Member]	Sep. 30, 2011 South Korean won [Member]	Mar. 31, 2011 South Korean won [Member]	Sep. 30, 2011 Norwegian krone [Member]	Mar. 31, 2011 Norwegian krone [Member]	Sep. 30, 2011 Brazilian real [Member]	Mar. 31, 2011 Brazilian real [Member]	Jun. 30, 2011 Canadian dollar [Member]	Mar. 31, 2011 Canadian dollar [Member]	Sep. 30, 2011 Other [Member]	Mar. 31, 2011 Other [Member]	Sep. 30, 2011 Israeli shekel [Member]	Mar. 31, 2011 Israeli shekel [Member]	Sep. 30, 2011 Indian rupee [Member]	Mar. 31, 2011 Indian rupee [Member]	Sep. 30, 2011 Mexican Peso [Member]	Mar. 31, 2011 Mexican Peso [Member]
Notional amounts at contract exchange rates of foreign currency forward contracts
Foreign Currency Forward Contracts (receive United States dollar/pay foreign currency)	$ 226.6	$ 213.0	$ 140.7	$ 158.5	$ 32.6	$ 13.9	$ 15.6	$ 5.0	$ 9.8	$ 7.6	$ 5.0	$ 2.9	$ 4.5	$ 1.5	$ 3.7	$ 3.0	$ 3.0	$ 4.6	$ 2.9	$ 2.0	$ 2.5	$ 5.6	$ 0	$ 4.2	$ 6.3	$ 4.2
Foreign Currency Forward Contracts (pay United States dollar/receive foreign currency)	$ 137.7	$ 172.2																							$ 3.0	$ 2.2	$ 118.4	$ 151.6	$ 11.7	$ 9.1	$ 4.6	$ 9.3