Note 17 - Preferred Stock (Detail) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended	3 Months Ended				1 Months Ended
	Jul. 31, 2012	Mar. 31, 2012	Mar. 31, 2012 Series I Preferred Stock [Member]	Jun. 30, 2012 Series I Preferred Stock [Member]	Dec. 31, 2011 Series I Preferred Stock [Member]	Jul. 31, 2012 Series F Preferred Stock [Member]	Jun. 30, 2012 Series F Preferred Stock [Member]	Dec. 31, 2011 Series F Preferred Stock [Member]	Jun. 30, 2012 Series G Preferred Stock [Member]	Dec. 31, 2011 Series G Preferred Stock [Member]	Jun. 30, 2012 Series H Preferred Stock [Member]	Dec. 31, 2011 Series H Preferred Stock [Member]	Jun. 30, 2012 Preferred Depositary Shares [Member]
Stock Issued During Period, Shares, New Issues (in Shares)	9,000,000		16,000,000
Preferred Stock, Dividend Rate, Percentage			6.00%			6.65%
Preferred Stock, Par or Stated Value Per Share			$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00	$ 1.00
Preferred Stock, Initial Offering Price			$ 25.00
Preferred Stock, Dividend Rate, Per-Dollar-Amount	$ 1.375		$ 1.50
Preferred Stock, Redemption Price Per Share	$ 25.00		$ 25.00
Proceeds from Issuance of Redeemable Preferred Stock (in Dollars)	$ 217.8	$ 387.2
Number of Votes			1,000
Number of Proxies			1,000
Number of Votes, Depositary			1
Preferred Stock, Liquidation Preference Per Share				$ 25,000.00			$ 250.00		$ 2,500.00		$ 2,500.00		$ 25.00