Goodwill and Other Intangible Assets - Carrying Value and Accumulated Amortization for Each Major Class of Intangible Assets Other Than Goodwill (Detail) (USD $) In Millions, unless otherwise specified				12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended		12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Gaming rights [Member]	Dec. 31, 2011 Gaming rights [Member]	Dec. 31, 2012 Trademarks [Member]	Dec. 31, 2011 Trademarks [Member]	Dec. 31, 2012 Customer relationships [Member]	Dec. 31, 2011 Customer relationships [Member]	Dec. 31, 2012 Contract rights [Member]	Dec. 31, 2011 Contract rights [Member]	Dec. 31, 2012 Patented technology [Member]	Dec. 31, 2011 Patented technology [Member]
Intangible Assets Excluding Goodwill [Line Items]
Weighted Average Remaining Useful Life (in years)				11 years 6 months		1 month 6 days		7 years		2 years		3 years 9 months 18 days
Gross Carrying Amount	$ 1,803.0	$ 1,770.6		$ 42.8	$ 42.8	$ 1.7	$ 7.8	$ 1,456.7	$ 1,456.7	$ 145.1	$ 144.4	$ 156.7	$ 118.9
Accumulated Amortization	(775.4)	(606.9)		(12.8)	(10.2)	(1.7)	(6.1)	(618.0)	(492.4)	(66.3)	(52.3)	(76.6)	(45.9)
Net Carrying Amount	1,027.6	1,163.7	1,235.1	30.0	32.6	0	1.7	838.7	964.3	78.8	92.1	80.1	73.0
Carrying value and accumulated amortization for each major class of intangible assets other than goodwill
Non amortizing intangible assets	2,958.1	3,199.5	3,184.0	1,258.4	1,290.8	1,699.7	1,908.7
Total intangible assets other than goodwill	$ 3,985.7	$ 4,363.2