Financial Instruments (Details 4) (USD $) In Millions	Jun. 30, 2011	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)	$ 278.4	$ 213.0
Foreign Currency Forward Contracts (Pay United States dollar/receive foreign currency)	179.6	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)	197.5	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)	25.3	13.9
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)	13.2	5.6
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)	9.3	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)	8.8	7.6
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)	4.4	2.9
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)	3.9	1.5
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)	3.8	4.6
Norwegian krone [Member]
Notional amounts at contract exchange rates of foreign currency forward contracts
Foreign Currency Forward Contracts (Receive United States dollar/pay foreign currency)	3.6	2.0
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)	3.6	3.0
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
Other [Member]
Notional amounts at contract exchange rates of foreign currency forward contracts
Foreign Currency Forward Contracts (Receive United States dollar/pay foreign currency)	5.0	4.2
Foreign Currency Forward Contracts (Pay United States dollar/receive foreign currency)	3.8	2.2
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)	161.9	151.6
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)	7.7	9.1
Mexican Peso [Member]
Notional amounts at contract exchange rates of foreign currency forward contracts
Foreign Currency Forward Contracts (Pay United States dollar/receive foreign currency)	$ 6.2	$ 9.3