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Interest Paid Included in Net Cash Provided by Operating Activities (Detail) (USD $) In Millions, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2010 | Dec. 31, 2011 | Jun. 30, 2010 | Jun. 30, 2009
Other Significant Noncash Transactions [Line Items] |  |  |  |
Interest paid before capitalization | $ 36.4 | $ 63.6 | $ 71.7 | $ 137.5

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