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Estimated Fair Values of Financial Instruments (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Financial assets
Cash and cash equivalents	$ 458.0us-gaap_CashAndCashEquivalentsAtCarryingValue		$ 325.0us-gaap_CashAndCashEquivalentsAtCarryingValue		$ 655.6us-gaap_CashAndCashEquivalentsAtCarryingValue	$ 744.0us-gaap_CashAndCashEquivalentsAtCarryingValue
Receivables	226.5us-gaap_ReceivablesNetCurrent		272.6us-gaap_ReceivablesNetCurrent
Non-current investments	286.5us-gaap_LongTermInvestments		268.9us-gaap_LongTermInvestments
Financial liabilities
Long-term loans	1,770.7us-gaap_LongTermDebtNoncurrent		1,938.6us-gaap_LongTermDebtNoncurrent
Accounts payable and provisions	498.5us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent		445.0us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent
Interest payable	11.2us-gaap_InterestPayableCurrent		12.4us-gaap_InterestPayableCurrent
Short-term loans and current portion of long-term loans	140.2us-gaap_DebtCurrent		121.5us-gaap_DebtCurrent
Other non-current liabilities	9.1us-gaap_OtherLiabilitiesNoncurrent		10.9us-gaap_OtherLiabilitiesNoncurrent
Carrying (Reported) Amount, Fair Value Disclosure
Financial assets
Cash and cash equivalents	458.0us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember		325.0us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Receivables	122.4us-gaap_ReceivablesNetCurrent / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember		146.7us-gaap_ReceivablesNetCurrent / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Non-current investments	286.5us-gaap_LongTermInvestments / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember	[1]	268.9us-gaap_LongTermInvestments / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember	[1]
Financial liabilities
Long-term loans	1,770.7us-gaap_LongTermDebtNoncurrent / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember		1,938.6us-gaap_LongTermDebtNoncurrent / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Accounts payable and provisions	460.6us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember		402.1us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Interest payable	11.2us-gaap_InterestPayableCurrent / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember		12.4us-gaap_InterestPayableCurrent / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Short-term loans and current portion of long-term loans	140.2us-gaap_DebtCurrent / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember		121.5us-gaap_DebtCurrent / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Other non-current liabilities	9.1us-gaap_OtherLiabilitiesNoncurrent / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember		10.9us-gaap_OtherLiabilitiesNoncurrent / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Fair value
Financial assets
Cash and cash equivalents	458.0us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember		325.0us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Receivables	122.4us-gaap_ReceivablesNetCurrent / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember		146.7us-gaap_ReceivablesNetCurrent / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Non-current investments	279.9us-gaap_LongTermInvestments / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember	[1]	269.7us-gaap_LongTermInvestments / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember	[1]
Financial liabilities
Long-term loans	1,614.4us-gaap_LongTermDebtNoncurrent / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember		1,794.4us-gaap_LongTermDebtNoncurrent / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Accounts payable and provisions	460.6us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember		402.1us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Interest payable	11.2us-gaap_InterestPayableCurrent / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember		12.4us-gaap_InterestPayableCurrent / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Short-term loans and current portion of long-term loans	140.2us-gaap_DebtCurrent / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember		121.5us-gaap_DebtCurrent / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Other non-current liabilities	$ 9.1us-gaap_OtherLiabilitiesNoncurrent / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember		$ 10.9us-gaap_OtherLiabilitiesNoncurrent / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
[1] Fair value determined by using cost for Far South East due to a market value not being readily available.

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