Financial Instruments (Details 4) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Mar. 31, 2011
Notional amounts at contract exchange rates of foreign currency forward contracts
Foreign Currency Forward Contracts (receive United States dollar/pay foreign currency)	$ 322.0	$ 213.0
Foreign Currency Forward Contracts (pay United States dollar/receive foreign currency)	178.0	172.2
Euro [Member]
Notional amounts at contract exchange rates of foreign currency forward contracts
Foreign Currency Forward Contracts (receive United States dollar/pay foreign currency)	214.2	158.5
Australian dollar [Member]
Notional amounts at contract exchange rates of foreign currency forward contracts
Foreign Currency Forward Contracts (receive United States dollar/pay foreign currency)	29.9	13.9
British Pound [Member]
Notional amounts at contract exchange rates of foreign currency forward contracts
Foreign Currency Forward Contracts (receive United States dollar/pay foreign currency)	19.2	5.0
Chinese yuan renminbi [Member]
Notional amounts at contract exchange rates of foreign currency forward contracts
Foreign Currency Forward Contracts (receive United States dollar/pay foreign currency)	11.7	7.6
Brazilian real [Member]
Notional amounts at contract exchange rates of foreign currency forward contracts
Foreign Currency Forward Contracts (receive United States dollar/pay foreign currency)	8.7	5.6
Swedish Krona [Member]
Notional amounts at contract exchange rates of foreign currency forward contracts
Foreign Currency Forward Contracts (receive United States dollar/pay foreign currency)	8.2	2.4
Swiss Franc [Member]
Notional amounts at contract exchange rates of foreign currency forward contracts
Foreign Currency Forward Contracts (receive United States dollar/pay foreign currency)	6.8	1.5
Danish Krone [Member]
Notional amounts at contract exchange rates of foreign currency forward contracts
Foreign Currency Forward Contracts (receive United States dollar/pay foreign currency)	3.9	3.0
Singapore Dollar [Member]
Notional amounts at contract exchange rates of foreign currency forward contracts
Foreign Currency Forward Contracts (receive United States dollar/pay foreign currency)	3.8	0.6
New Zealand dollar [Member]
Notional amounts at contract exchange rates of foreign currency forward contracts
Foreign Currency Forward Contracts (receive United States dollar/pay foreign currency)	3.4	2.9
South Korean won [Member]
Notional amounts at contract exchange rates of foreign currency forward contracts
Foreign Currency Forward Contracts (receive United States dollar/pay foreign currency)	2.6	4.6
Canadian dollar [Member]
Notional amounts at contract exchange rates of foreign currency forward contracts
Foreign Currency Forward Contracts (receive United States dollar/pay foreign currency)		4.2
Israeli shekel [Member]
Notional amounts at contract exchange rates of foreign currency forward contracts
Foreign Currency Forward Contracts (pay United States dollar/receive foreign currency)	158.2	151.6
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)	3.2
Foreign Currency Forward Contracts (pay United States dollar/receive foreign currency)		9.3
Indian rupee [Member]
Notional amounts at contract exchange rates of foreign currency forward contracts
Foreign Currency Forward Contracts (pay United States dollar/receive foreign currency)	15.0	9.1
Other [Member]
Notional amounts at contract exchange rates of foreign currency forward contracts
Foreign Currency Forward Contracts (receive United States dollar/pay foreign currency)	6.4	3.2
Foreign Currency Forward Contracts (pay United States dollar/receive foreign currency)	$ 4.8	$ 2.2