Note 20 - Incentive Plans (Details) - Stock Options Activity - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Stock Options Activity [Abstract]
Options outstanding, January 1, 2013	11,893,761	15,374,145	16,557,997
Options outstanding, January 1, 2013	$ 30.23	$ 28.79	$ 28.42
Options outstanding, January 1, 2013	$ 29.8	$ 13.1	$ 14.9
Options Outstanding, Shares	9,012,441	11,893,761	15,374,145
Options Outstanding, Weighted-Average Exercise Price Per Share	$ 31.09	$ 30.23	$ 28.79
Options Outstanding, Aggregate Intrinsic Value	$ 27.4	$ 29.8	$ 13.1
Options Exercised, Shares	(1,019,240)	(1,474,432)	(1,636,300)
Options Exercised, Weighted-Average Exercise Price Per Share	$ 18.36	$ 16.19	$ 23.15
Granted			1,354,250
Granted			$ 21.55
Options Forfeited, Shares	(1,862,080)	(2,005,952)	(901,802)
Options Forfeited, Weighted-Average Exercise Price Per Share	$ 32.55	$ 28.68	$ 31.38
Options exercisable (fully vested) -
Options Exercisable, Shares	7,617,882	10,159,570	12,039,439
Options Exercisable, Weighted-Average Exercise Price Per Share	$ 32.90	$ 31.96	$ 31.24
Options Exercisable, Aggregate Intrinsic Value	$ 20.0	$ 19.9	$ 8.2