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Finance Expense (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Finance Expense [Abstract] |  |  |
Interest expense | $ (105.0)us-gaap_InterestExpenseOther | $ (90.7)us-gaap_InterestExpenseOther | $ (68.6)us-gaap_InterestExpenseOther
Capitalized interest | 24.2 us-gaap_InterestCostsCapitalizedAdjustment | 18.3 us-gaap_InterestCostsCapitalizedAdjustment | 13.0 us-gaap_InterestCostsCapitalizedAdjustment
Total finance expense | $ (80.8)us-gaap_InterestExpenseBorrowings | $ (72.4)us-gaap_InterestExpenseBorrowings | $ (55.6)us-gaap_InterestExpenseBorrowings

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- Definition Amount of interest costs capitalized disclosed as an adjusting item to interest costs incurred. + References No definition available. + Details
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- Details
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- Definition Aggregate amount of interest expense on all borrowings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.7,8) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition Interest expense on all other items not previously classified. For example, includes dividends associated with redeemable preferred stock of a subsidiary that is treated as a liability in the parent's consolidated balance sheet. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624177-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph -4 -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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