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Derivative Instruments - Interest Rate Swap Agreements (Parenthetical) (Detail) In Millions, unless otherwise specified | Dec. 31, 2012 USD ($) | Dec. 31, 2012 EUR (€)
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Derivative [Line Items] |  |
Minimum variable interest rate on Debt | 0.30% | 0.30%
Maximum variable interest rate on Debt | 2.75% | 2.75%
Reduced Principal amount denominated Interest rate swaps | $ 92.5 | € 70.1

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