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Acquisitions, Investments, Dispositions and Divestitures - Components of Assets and Liabilities Held for Sale (Detail) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Assets    
Assets held for sale, current $ 5.4 $ 5.1
Liabilities    
Liabilities held for sale, current 0.7 3.8
Macau and Marketplace Parcels in Atlantic City [Member]
   
Assets    
Cash and cash equivalents 4.9 4.7
Other current assets 0.5 0.4
Assets held for sale, current 5.4 5.1
Property and equipment, net 466.0 471.2
Assets held for sale, non-current 466.0 471.2
Liabilities    
Accounts payable and accrued expenses 0.7 3.8
Liabilities held for sale, current 0.7 3.8
Deferred credits and other 2.5 0.2
Deferred income taxes 51.8 51.9
Liabilities held for sale, non-current $ 54.3 $ 52.1