Income Taxes (Details) - Components of income tax provision (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Income Taxes [Abstract]
Federal	$ 141.0	$ 92.6	$ 87.7
State	14.6	8.5	6.6
Foreign	23.5	14.1	14.4
Total current	179.1	115.2	108.7
Federal	(36.6)	(16.8)	18.6
State	(1.8)	(0.8)	3.5
Foreign	(11.1)	(4.5)	4.8
Total deferred	(49.5)	(22.1)	26.9
Total income tax provision	$ 129.6	$ 93.1	$ 135.6