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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, 2013 | Dec. 31, 2012
--- | --- | ---
Derivative [Line Items] |  |
Total debt | $ 2,555.1 | $ 2,457.4
Carrying (Reported) Amount, Fair Value Disclosure |  |
Derivative [Line Items] |  |
Variable rate debt | 528.9 | 427.7
Fixed rate debt | 2,026.2 | 2,029.7
Total debt | 2,555.1 | 2,457.4
Estimate of Fair Value, Fair Value Disclosure |  |
Derivative [Line Items] |  |
Variable rate debt | 528.9 | 427.7
Fixed rate debt | 2,002.2 | 2,081.3
Total debt | $ 2,531.1 | $ 2,509.0

X
- Definition Represents the aggregate of total long-term debt, including current maturities and short-term debt. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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X
- Details
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X
- 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
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X
- 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
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