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	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Intangible Assets Excluding Goodwill [Line Items]
Gross Carrying Amount	$ 1,802.0	$ 1,803.0
Accumulated Amortization	(816.2)	(775.4)
Net Carrying Amount	985.8	1,027.6
Carrying value and accumulated amortization for each major class of intangible assets other than goodwill
Non-amortizing intangible assets	2,936.1	2,958.1
Total intangible assets other than goodwill	3,921.9	3,985.7
Gaming rights [Member]
Intangible Assets Excluding Goodwill [Line Items]
Weighted Average Remaining Useful Life (in years)	11 years 3 months 18 days
Gross Carrying Amount	42.8	42.8
Accumulated Amortization	(13.5)	(12.8)
Net Carrying Amount	29.3	30.0
Carrying value and accumulated amortization for each major class of intangible assets other than goodwill
Non-amortizing intangible assets	1,237.1	1,258.4
Trademarks [Member]
Intangible Assets Excluding Goodwill [Line Items]
Weighted Average Remaining Useful Life (in years)	0 years
Gross Carrying Amount	1.7	1.7
Accumulated Amortization	(1.7)	(1.7)
Net Carrying Amount	0	0
Carrying value and accumulated amortization for each major class of intangible assets other than goodwill
Non-amortizing intangible assets	1,699.0	1,699.7
Customer relationships [Member]
Intangible Assets Excluding Goodwill [Line Items]
Weighted Average Remaining Useful Life (in years)	6 years 9 months 18 days
Gross Carrying Amount	1,456.7	1,456.7
Accumulated Amortization	(649.5)	(618.0)
Net Carrying Amount	807.2	838.7
Contract rights [Member]
Intangible Assets Excluding Goodwill [Line Items]
Weighted Average Remaining Useful Life (in years)	1 year 8 months 18 days
Gross Carrying Amount	144.0	145.1
Accumulated Amortization	(68.9)	(66.3)
Net Carrying Amount	75.1	78.8
Patented technology [Member]
Intangible Assets Excluding Goodwill [Line Items]
Weighted Average Remaining Useful Life (in years)	3 years 6 months 6 days
Gross Carrying Amount	156.8	156.7
Accumulated Amortization	(82.6)	(76.6)
Net Carrying Amount	$ 74.2	$ 80.1