XML 22 R76.htm IDEA: XBRL DOCUMENT v2.4.0.8
Impairment Charges and Impairment of Joint Venture Investments - Impairment Charges Measured at Fair Value on Non-Recurring Basis (Detail) (Fair Value Measurements [Member], USD $)
In Millions, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Long-lived assets held and used and held for sale, Fair Value Measurements $ 93.3 $ 180.7
Unconsolidated joint venture investment, Fair Value Measurements   4.7
Deconsolidated joint venture investment, Fair Value Measurements   56.1
Long-lived assets held and used and held for sale, Total Losses 42.6 126.5
Unconsolidated joint venture investments, Total Losses   26.7
Deconsolidated joint venture investment, Total Losses   9.3
Level 1 [Member]
    
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Long-lived assets held and used and held for sale, Fair Value Measurements 0 0
Unconsolidated joint venture investment, Fair Value Measurements   0
Deconsolidated joint venture investment, Fair Value Measurements   0
Level 2 [Member]
    
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Long-lived assets held and used and held for sale, Fair Value Measurements 0 0
Unconsolidated joint venture investment, Fair Value Measurements   0
Deconsolidated joint venture investment, Fair Value Measurements   0
Level 3 [Member]
    
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]    
Long-lived assets held and used and held for sale, Fair Value Measurements 93.3 180.7
Unconsolidated joint venture investment, Fair Value Measurements   4.7
Deconsolidated joint venture investment, Fair Value Measurements   $ 56.1