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Derivatives and Financial Instruments - Recorded Amounts and Estimated Fair Values of Long-term Debt and Derivative Financial Instruments (Detail) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Derivative [Line Items] |  |
Total debt | $ 3,004.1 us-gaap_DebtLongtermAndShorttermCombinedAmount | $ 2,550.4 us-gaap_DebtLongtermAndShorttermCombinedAmount
Carrying (Reported) Amount, Fair Value Disclosure |  |
Derivative [Line Items] |  |
Variable rate debt | 997.4 us-gaap_LongtermDebtPercentageBearingVariableInterestAmount / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 528.9 us-gaap_LongtermDebtPercentageBearingVariableInterestAmount / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Fixed rate debt | 2,006.7 us-gaap_LongtermDebtPercentageBearingFixedInterestAmount / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 2,021.5 us-gaap_LongtermDebtPercentageBearingFixedInterestAmount / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Total debt | 3,004.1 us-gaap_DebtLongtermAndShorttermCombinedAmount / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember | 2,550.4 us-gaap_DebtLongtermAndShorttermCombinedAmount / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_CarryingReportedAmountFairValueDisclosureMember
Estimate of Fair Value, Fair Value Disclosure |  |
Derivative [Line Items] |  |
Variable rate debt | 997.4 us-gaap_LongtermDebtPercentageBearingVariableInterestAmount / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 528.9 us-gaap_LongtermDebtPercentageBearingVariableInterestAmount / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Fixed rate debt | 2,070.4 us-gaap_LongtermDebtPercentageBearingFixedInterestAmount / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | 1,997.5 us-gaap_LongtermDebtPercentageBearingFixedInterestAmount / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember
Total debt | $ 3,067.8 us-gaap_DebtLongtermAndShorttermCombinedAmount / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember | $ 2,526.4 us-gaap_DebtLongtermAndShorttermCombinedAmount / us-gaap_FairValueByMeasurementBasisAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember

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- Definition Represents the aggregate of total long-term debt, including current maturities and short-term debt. + References No definition available. + Details
Name: | us-gaap_DebtLongtermAndShorttermCombinedAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate. + References No definition available. + Details
Name: | us-gaap_LongtermDebtPercentageBearingFixedInterestAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time. + References No definition available. + Details
Name: | us-gaap_LongtermDebtPercentageBearingVariableInterestAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |