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	9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Intangible Assets Excluding Goodwill [Line Items]
Gross Carrying Amount	$ 1,771.3	$ 1,770.6
Accumulated Amortization	(736.9)	(606.9)
Net Carrying Amount	1,034.4	1,163.7
Carrying value and accumulated amortization for each major class of intangible assets other than goodwill
Non amortizing intangible assets	3,008.3	3,199.5
Total intangible assets other than goodwill	4,042.7	4,363.2
Customer relationships [Member]
Intangible Assets Excluding Goodwill [Line Items]
Weighted Average Remaining Useful Life (in years)	7 years 3 months 18 days
Gross Carrying Amount	1,456.7	1,456.7
Accumulated Amortization	(586.8)	(492.4)
Net Carrying Amount	869.9	964.3
Contract rights [Member]
Intangible Assets Excluding Goodwill [Line Items]
Weighted Average Remaining Useful Life (in years)	2 years 2 months 12 days
Gross Carrying Amount	145.1	144.4
Accumulated Amortization	(62.9)	(52.3)
Net Carrying Amount	82.2	92.1
Patented technology [Member]
Intangible Assets Excluding Goodwill [Line Items]
Weighted Average Remaining Useful Life (in years)	3 years 7 months 6 days
Gross Carrying Amount	118.9	118.9
Accumulated Amortization	(67.7)	(45.9)
Net Carrying Amount	51.2	73.0
Gaming rights [Member]
Intangible Assets Excluding Goodwill [Line Items]
Weighted Average Remaining Useful Life (in years)	11 years 9 months 18 days
Gross Carrying Amount	42.8	42.8
Accumulated Amortization	(12.2)	(10.2)
Net Carrying Amount	30.6	32.6
Carrying value and accumulated amortization for each major class of intangible assets other than goodwill
Non amortizing intangible assets	1,259.4	1,290.8
Trademark [Member]
Intangible Assets Excluding Goodwill [Line Items]
Weighted Average Remaining Useful Life (in years)	3 months 18 days
Gross Carrying Amount	7.8	7.8
Accumulated Amortization	(7.3)	(6.1)
Net Carrying Amount	0.5	1.7
Carrying value and accumulated amortization for each major class of intangible assets other than goodwill
Non amortizing intangible assets	$ 1,748.9	$ 1,908.7