Accumulated Other Comprehensive Income (Loss) - Accumulated other comprehensive income (loss) and related components (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Aug. 31, 2014
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning of period	$ 39.3
OCI before reclassifications	(47.2)
Reclassifications	3.0
End of period	(4.9)
Unrecognized Actuarial Gains (Losses) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning of period	(11.0)
OCI before reclassifications	0.3
Reclassifications	0
End of period	(10.7)
Foreign Currency Translation Adjustments [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning of period	62.6
OCI before reclassifications	(48.2)
Reclassifications	0
End of period	14.4
Unrealized Gain (Loss) on Interest Rate Swaps [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning of period	(12.3)
OCI before reclassifications	0.6
Reclassifications	3.0
End of period	(8.7)
Unrealized Gain (Loss) on Available-For-Sale Securities [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning of period	0
OCI before reclassifications	0.1
Reclassifications	0
End of period	$ 0.1