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Impairment Charges and Reserves - Impairment Charges Measured at Fair Value on Non-Recurring Basis (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Preferred equity interests, Total Losses $ (15.4) $ 0.0 $ 60.6 $ 0.0
Fair Value Measurements [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Long-lived assets held and used, Fair Value Measurements 141.0   141.0  
Preferred equity interests, Fair Value Measurements 327.3   327.3  
Long-lived assets held and used, Total Losses     60.4  
Preferred equity interests, Total Losses     60.6  
Fair Value Measurements [Member] | Level 1 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Long-lived assets held and used, Fair Value Measurements 0.0   0.0  
Preferred equity interests, Fair Value Measurements 0.0   0.0  
Fair Value Measurements [Member] | Level 2 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Long-lived assets held and used, Fair Value Measurements 0.0   0.0  
Preferred equity interests, Fair Value Measurements 0.0   0.0  
Fair Value Measurements [Member] | Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Long-lived assets held and used, Fair Value Measurements 141.0   141.0  
Preferred equity interests, Fair Value Measurements $ 327.3   $ 327.3