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Domestic Medium Term Notes Program (Detail) (USD $) In Millions, unless otherwise specified |  |  | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2011 Uncollateralized Domestic Medium Term Notes Program
Debt Instrument [Line Items] |  |  |
Opening balance | $ 2,361.2 | $ 1,907.7 | $ 108.9
Settlements |  |  | (105.3)
Translation |  |  | (3.6)
Closing balance | $ 2,361.2 | $ 1,907.7 |

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