Acquisitions, Investments, Dispositions and Divestitures - Components of Assets and Liabilities Held for Sale (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Assets
Assets held for sale, current	$ 5.2	$ 5.1
Liabilities
Liabilities held for sale, current	3.5	3.8
Alea Leeds Casino and Macau [Member]
Assets
Cash and cash equivalents	4.8	4.7
Other current assets	0.4	0.4
Assets held for sale, current	5.2	5.1
Property and equipment, net	442.6	471.2
Assets held for sale, non-current	442.6	471.2
Liabilities
Accounts payable and accrued expenses	3.5	3.8
Liabilities held for sale, current	3.5	3.8
Deferred credits and other	0.3	0.2
Deferred income taxes	49.4	51.9
Liabilities held for sale, non-current	$ 49.7	$ 52.1

Disposal Group, Including Discontinued Operation, Deferred Credits and Other

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- Definition

Current assets (normally turning over within one year or one business cycle if longer) that are held for sale apart from normal operations and anticipated to be sold within one year.

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-Publisher FASB

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- Definition

Long-lived assets that are held for sale apart from normal operations and anticipated to be sold in less than one year.

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For the disposal group, including a component of the entity (discontinued operation), carrying value of obligations incurred and payable pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include interest, rent, salaries, and utilities.

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For the disposal group, including a component of the entity (discontinued operation), cash includes currency on hand as well as demand deposits with banks or financial institutions. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.

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-Glossary Cash

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-Glossary Cash Equivalents

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- Definition

For a disposal group, including a component of the entity (discontinued operation), represents deferred tax liabilities, which result from applying the applicable tax rate to net taxable temporary differences pertaining to each jurisdiction to which the entity is obligated to pay income tax. A taxable temporary difference is a difference between the tax basis and the carrying amount of a asset or liability in the financial statements prepared in accordance with generally accepted accounting principles.

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For the disposal group, including a component of the entity (discontinued operation), carrying amount of assets not otherwise specified in the taxonomy that are expected to be realized or consumed within one year or the normal operating cycle, if longer.

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For the disposal group, including a component of the entity (discontinued operation), carrying value (net of accumulated depreciation and any write-downs) of tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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- Definition

Liability (such as a mortgage) related to a disposal group that is held for sale and anticipated to be sold in less than one year. The liability is expected to be discharged as part of the plan of sale for the asset.

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Carrying value of noncurrent obligations (due more than one year or one operating cycle, whichever is longer) relating to the sale, disposal or planned sale in the near future (generally within one year) of a disposal group, including a component of the entity (discontinued operation), as of the balance sheet date.

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-Paragraph 46, 47

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