Presentation Of Condensed Financial Statements (Narrative) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012	Mar. 31, 2011	Sep. 30, 2011
Comprehensive income			$ 99.8
Net earnings	22.5	83.3	87.8	154.6
Earnings from continuing operations	29.4	44.5	73.6	81.8
Net earnings per share, basic	$ 0.41	$ 1.52	$ 1.59	$ 2.82
Earnings from continuing operations, basic	$ 0.54	$ 0.81	$ 1.33	$ 1.49
Assets	4,452.7		4,452.7		6,279.2
Liabilities	2,773.4		2,773.4		3,714.0
Total shareholders' equity	1,679.3		1,679.3		2,565.2
Decrease in cash flows from operating activities for continuing operations			124.0	143.7
Effect Of Correction Of Accounting Errors [Member]
Gain (loss) on economic hedges	5.7		5.7
Comprehensive income	0.9		0.9
Net earnings	(3.7)		(3.7)
Earnings from continuing operations	(3.7)		(3.7)
Net earnings per share, basic	$ (0.06)		$ (0.06)
Earnings from continuing operations, basic	$ (0.07)		$ (0.07)
Assets	(2.0)		(2.0)
Liabilities	(9.5)		(9.5)
Total shareholders' equity	7.5		7.5
Decrease in cash flows from operating activities for continuing operations			$ (2.9)	$ (4.7)