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Finance Expenses (Detail) (USD $)
In Millions, unless otherwise specified
 6 Months Ended 12 Months Ended
Dec. 31, 2010
Dec. 31, 2012
Dec. 31, 2011
Jun. 30, 2010
Component of Other Expense, Nonoperating [Line Items]        
Interest expense - preference share dividend $ (3.1)   $ (1.3) $ (5.9)
Interest expense - other (33.3) (83.1) (62.3) (65.8)
Total finance expense (36.4) (83.1) (63.6) (71.7)
Capitalized interest 4.7 13.0 9.3 6.5
Finance expense $ (31.7) $ (70.1) $ (54.3) $ (65.2)