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Finance Expense (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	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	24.2us-gaap_InterestCostsCapitalizedAdjustment	18.3us-gaap_InterestCostsCapitalizedAdjustment	13.0us-gaap_InterestCostsCapitalizedAdjustment
Total finance expense	$ (80.8)us-gaap_InterestExpenseBorrowings	$ (72.4)us-gaap_InterestExpenseBorrowings	$ (55.6)us-gaap_InterestExpenseBorrowings

X

- Definition

Amount of interest costs capitalized disclosed as an adjusting item to interest costs incurred.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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X

- Details

Name:	us-gaap_InterestExpenseAbstract
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Balance Type:	na
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X

- 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

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X

- 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

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