Quarterly Financial Data (Unaudited) - Quarterly Financial Data (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended					3 Months Ended	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2014 First [Member]	Sep. 30, 2013 First [Member]	Mar. 31, 2014 Second [Member]	Sep. 30, 2014 Second [Member]		Sep. 30, 2013 Second [Member]	Sep. 30, 2014 Third [Member]	Sep. 30, 2013 Third [Member]	Sep. 30, 2014 Fourth [Member]	Sep. 30, 2013 Fourth [Member]
2014
Total revenues	$ 2,058.1	$ 2,341.6	$ 2,150.7	$ 541.2	$ 530.3		$ 512.8		$ 600.0	$ 467.6	$ 579.0	$ 536.5	$ 632.3
Gross profit				309.8	309.5		292.8		341.3	284.9	337.1	327.1	356.5
Operating income	408.6	494.1	421.7	103.7	118.4		72.1	[1]	129.3	109.6	123.0	123.2	123.4
Income from continuing operations	247.9	272.7	249.7	79.2	65.3		25.7	[1]	78.2	72.1	65.7	70.9	63.5
Net income				79.2	65.3		25.7	[1]	78.2	72.1	65.7	70.9	63.5
Diluted EPS (in Dollars per share)	$ 0.99	$ 1.03	$ 0.85	$ 0.31	$ 0.24		$ 0.10	[1]	$ 0.29	$ 0.29	$ 0.25	$ 0.28	$ 0.24
Business Realignment						$ 16.5

[1] Our 2014 second quarter included business realignment restructuring charges of $16.5 million. See Note 20.