Financial Instruments (Details 4) (USD $) In Millions, unless otherwise specified	Dec. 31, 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)	$ 292.4	$ 213.0
Foreign Currency Forward Contracts (pay United States dollar/receive foreign currency)	156.6	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)	186.0	158.5
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)	33.6	5.0
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)	19.9	13.9
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)	11.1	7.6
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)	6.5	2.4
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)	5.5	2.0
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)	5.4	1.5
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)	5.3	5.6
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)	5.2	2.9
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)	4.3	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)	3.0	0.6
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)	2.8	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)	0	4.2
Foreign Currency Forward Contracts (pay United States dollar/receive foreign currency)	4.7	0
Other [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	1.2
Foreign Currency Forward Contracts (pay United States dollar/receive foreign currency)	0.6	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)	138.0	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)	13.3	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)	$ 0	$ 9.3