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Derivative Instruments (Details) (USD $)
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Aug. 31, 2014
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Feb. 28, 2014
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Apr. 30, 2012
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Designated as hedging instrument [Member] | Cash flow hedging [Member] | Foreign currency contracts [Member]
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| Derivative [Line Items] | |||
| Absolute notional value of derivative instruments | $ 628,300,000 | $ 636,600,000 | |
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Designated as hedging instrument [Member] | Cash flow hedging [Member] | Interest rate swap contracts [Member]
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| Derivative [Line Items] | |||
| Absolute notional value of derivative instruments | 500,000,000 | 500,000,000 | 500,000,000.0 |
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Not designated as hedging instrument [Member] | Foreign currency contracts [Member]
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| Derivative [Line Items] | |||
| Absolute notional value of derivative instruments | 1,000,000,000 | 643,800,000 | |
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Not designated as hedging instrument [Member] | Interest rate swap contracts [Member]
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| Derivative [Line Items] | |||
| Absolute notional value of derivative instruments | 1,000,000,000 | 1,000,000,000.0 | 500,000,000.0 |
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Not designated as hedging instrument [Member] | Commodity swap contracts [Member]
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| Derivative [Line Items] | |||
| Absolute notional value of derivative instruments | $ 194,400,000 | $ 88,000,000 |