Income Taxes (Details) - Classification Of Deferred Income Taxes (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Deferred Tax Assets
Reserves	$ 127.7	$ 106.4
Jackpot payment timing difference	119.5	134.3
Share-based compensation	29.6	28.9
Net operating loss carryforwards	36.1	45.4
Goodwill and intangibles	58.4	44.8
Capital loss carryover	24.4	26.2
Other	11.7	14.4
Total deferred income tax assets	407.4	400.4
Valuation allowance	(63.2)	(74.0)
Total deferred income tax assets, net	344.2	326.4
Deferred Tax Liabilities
Interest expense on convertible debt	(38.7)	(39.4)
Property, plant and equipment	(15.3)	(31.4)
Intangibles	(36.3)	(42.2)
Other	(14.3)	(13.3)
Total deferred income tax liabilities	(104.6)	(126.3)
Net Deferred Income Tax Assets	$ 239.6	$ 200.1