Acquisitions (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended		3 Months Ended				1 Months Ended	3 Months Ended
	Nov. 30, 2012	Nov. 30, 2011	Nov. 30, 2012 Telair and Nordisk	Aug. 31, 2012 Telair and Nordisk	May 31, 2012 Telair and Nordisk	Dec. 02, 2011 Telair and Nordisk	Oct. 31, 2011 Airinmar	May 31, 2012 Airinmar	Nov. 30, 2012 Airinmar Y	Aug. 31, 2012 Airinmar	Feb. 29, 2012 Airinmar	Oct. 11, 2011 Airinmar
Acquisitions
Purchase price of the acquisition					$ 296.5	$ 280.0						$ 43.5
Cash consideration paid	16.5	19.5		16.5			23.2
Potential earn-out payment												20.3
Period over which EBITDA levels will be measured (in years)									2
Estimated liability of the acquisition date fair value of the earn-out											20.3
Reduction in estimated liability of the acquisition date fair value of the earn-out								3.4
Adjustment amount between goodwill and identified intangibles			11.0
Purchase price allocation
Cash			1.5							3.7
Accounts receivable			47.1							8.0
Inventories			54.5
Prepaid expenses			4.1							0.9
Property, plant and equipment			17.0							0.6
Deferred tax assets			34.3							5.3
Goodwill			103.9							21.6
Identified intangibles			120.0							20.8
Notes payable			(1.6)
Accounts payable			(14.7)							(6.7)
Deferred tax liabilities			(34.3)							(5.3)
Accrued liabilities			(27.5)							(5.4)
Other long-term liabilities			$ (7.8)