Consolidated Statements of Comprehensive Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Revenues
Gaming operations	$ 254.3	$ 266.1	$ 496.9	$ 518.1
Product sales	279.0	240.8	513.7	421.8
Interactive	66.7	34.3	119.6	46.9
Total revenues	600.0	541.2	1,130.2	986.8
Costs and operating expenses
Cost of gaming operations	97.6	103.0	187.1	201.0
Cost of product sales	135.0	108.8	244.2	198.2
Cost of interactive	26.1	15.8	48.2	22.0
Selling, general and administrative	110.7	109.3	210.9	199.1
Research and development	58.1	55.3	112.5	102.2
Depreciation and amortization	19.7	19.3	38.7	34.7
Contingent acquisition-related costs	21.9	11.7	39.3	11.7
Impairment	1.6		1.6
Total costs and operating expenses	470.7	423.2	882.5	768.9
Operating income	129.3	118.0	247.7	217.9
Other income (expense)
Interest income	11.1	10.8	22.4	22.9
Interest expense	(30.3)	(30.0)	(62.0)	(60.1)
Other	(2.5)	(2.0)	(2.7)	(4.8)
Total other income (expense)	(21.7)	(21.2)	(42.3)	(42.0)
Income from continuing operations before tax	107.6	96.8	205.4	175.9
Income tax provision	29.4	34.4	61.9	63.2
Income from continuing operations	78.2	62.4	143.5	112.7
Loss from discontinued operations, net of tax		(0.5)		(1.5)
Net income	78.2	61.9	143.5	111.2
Other comprehensive income (loss), net of $0 tax
Foreign currency translation adjustment	(8.5)	13.3	(5.1)	19.4
Unrealized loss on available-for-sale securities		(0.1)		(0.3)
Comprehensive income	$ 69.7	$ 75.1	$ 138.4	$ 130.3
Basic earnings (loss) per share
Continuing operations (in Dollars per share)	$ 0.30	$ 0.21	$ 0.54	$ 0.38
Discontinued operations (in Dollars per share)	$ 0	$ 0		$ (0.01)
Net income (in Dollars per share)	$ 0.30	$ 0.21	$ 0.54	$ 0.37
Diluted earnings (loss) per share
Continuing operations (in Dollars per share)	$ 0.29	$ 0.21	$ 0.54	$ 0.38
Discontinued operations (in Dollars per share)				$ (0.01)
Net income (in Dollars per share)	$ 0.29	$ 0.21	$ 0.54	$ 0.37
Cash dividends declared per share (in Dollars per share)	$ 0.08	$ 0.06	$ 0.15	$ 0.12
Weighted average shares outstanding
Basic (in Shares)	263.6	296.7	264.7	297.0
Diluted (in Shares)	265.6	298.1	266.7	298.6