Note 2 - Variable Interest and Affiliates (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended			1 Months Ended		3 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Sep. 30, 2011	Mar. 31, 2012 Operating Costs [Member] Latin America Distributor [Member]	Mar. 31, 2012 Contract Financing [Member] Latin America Distributor [Member]	Jun. 30, 2012 Latin America Distributor [Member]	Dec. 31, 2010 China LotSynergy Holdings, Ltd. [Member]	May 31, 2012 China LotSynergy Holdings, Ltd. [Member]
Variable Interest Entity, Consolidated, Carrying Amount, Assets and Liabilities, Net	$ 62.2		$ 62.2		$ 69.7
Variable Interest Entity, Financial or Other Support, Amount						0.8	13.0
Notes, Loans and Financing Receivable, Net, Noncurrent	140.0		140.0		126.4			3.1
Revenues	532.8	489.0	1,519.6	1,417.2				2.3
Available-for-sale Securities, Gross Realized Gain (Loss)									4.3
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds									16.5
Available-for-sale Securities, Debt Securities										$ 9.2