Acquisitions, Investments, Dispositions and Divestitures - Income from Discontinued Operations (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenues	$ 0.8	$ 66.8	$ 2.5	$ 132.8
Pre-tax income/(loss) from operations	(0.3)	(84.4)	(44.2)	(70.2)
Income/(loss), net of income taxes	(0.3)	(80.5)	(41.4)	(73.2)
Harrahs St. Louis [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenues	0	64.9	0	128.5
Pre-tax income/(loss) from operations	0	22.9	(0.7)	41.9
Income/(loss), net of income taxes	0	14.1	(0.4)	25.7
Macau [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenues	0.8	0.7	1.8	1.6
Pre-tax income/(loss) from operations	0.2	(105.9)	(20.5)	(109.6)
Income/(loss), net of income taxes	0.2	(93.2)	(18.0)	(96.4)
Alea Leeds [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenues	0	1.2	0.7	2.7
Pre-tax income/(loss) from operations	(0.5)	(1.4)	(23.0)	(2.5)
Income/(loss), net of income taxes	$ (0.5)	$ (1.4)	$ (23.0)	$ (2.5)