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Derivative Instruments and Hedging Activities - Schedule of Interest Rate Swap (Detail) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
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Feb. 28, 2014
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Feb. 28, 2013
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Feb. 28, 2014
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Feb. 28, 2013
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| Derivative Instruments and Hedging Activities Disclosure [Abstract] | ||||
| Amount of gain (loss) recognized in OCI | $ 5.5 | $ 10.7 | $ 31.7 | $ 9.5 |
| Amount of (gain) loss reclassified from accumulated OCI into interest expense (effective portion) | 6.2 | 9.0 | 20.5 | 40.4 |
| Amount (gain) loss recognized in other income (expense) (ineffective portion and amount excluded from effectiveness testing) | $ 21.8 | |||