Business Segments - Business Segment Information (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Schedule of Segment Reporting by Segment [Abstract]
Revenues	$ 2,058.1	$ 2,341.6	$ 2,150.7
Gaming operations	886.9	991.4	1,040.0
Product sales	847.0	1,085.2	966.8
Interactive	324.2	265.0	143.9
Gross profit	1,214.6	1,344.4	1,237.6
Gaming operations	547.4	617.1	634.3
Product sales	464.9	565.0	522.3
Interactive	202.3	162.3	81.0
Operating income	408.6	494.1	421.7
Depreciation and amortization	189.0	231.6	240.3
Long-lived assets	493.6	614.5	749.1
Additions to long-lived assets	89.6	129.7	210.2
Total assets	3,989.5	4,612.8	4,285.1
North America [Member]
Schedule of Segment Reporting by Segment [Abstract]
Revenues	1,619.2	1,835.1	1,644.1
Gaming operations	770.1	854.2	907.8
Product sales	562.5	759.8	648.2
Interactive	286.6	221.1	88.1
Gross profit	966.9	1,066.9	961.2
Gaming operations	462.9	522.4	541.2
Product sales	324.9	407.3	366.6
Interactive	179.1	137.2	53.4
Operating income	427.7	487.9	425.8
Depreciation and amortization	148.1	190.4	195.3
Long-lived assets	373.8	479.8	590.3
Additions to long-lived assets	67.9	103.3	146.2
Total assets	2,758.4	2,745.6	2,560.0
International [Member]
Schedule of Segment Reporting by Segment [Abstract]
Revenues	438.9	506.5	506.6
Gaming operations	116.8	137.2	132.2
Product sales	284.5	325.4	318.6
Interactive	37.6	43.9	55.8
Gross profit	247.7	277.5	276.4
Gaming operations	84.5	94.7	93.1
Product sales	140.0	157.7	155.7
Interactive	23.2	25.1	27.6
Operating income	90.6	120.1	103.6
Depreciation and amortization	34.1	35.3	40.3
Long-lived assets	36.5	51.1	79.4
Additions to long-lived assets	14.9	7.3	40.1
Total assets	695.9	760.1	812.7
Corporate [Member]
Schedule of Segment Reporting by Segment [Abstract]
Operating income	(109.7)	(113.9)	(107.7)
Depreciation and amortization	6.8	5.9	4.7
Long-lived assets	83.3	83.6	79.4
Additions to long-lived assets	6.8	19.1	23.9
Total assets	$ 535.2	$ 1,107.1	$ 912.4