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Debt and Credit Facilities - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012
Debt Disclosure [Line Items] |  |
Recognized net pre-tax loss | $ (32.3) |
Short-term borrowings | 77.0 | 39.2
5.25% Senior Notes due April 2023 [Member] |  |
Debt Disclosure [Line Items] |  |
Aggregate principal amount | 425 |
Debt interest rate | 5.25% | 5.25%
Senior notes maturity date | Apr. 01, 2023 |
Frequency of interest payments | Interest is payable on April 1 and October 1 of each year, commencing October 1, 2013. |
7.875% senior notes due June 2017 [Member] |  |
Debt Disclosure [Line Items] |  |
Debt interest rate | 7.875% |
Aggregate repurchase price of senior notes | 431 |
Premium paid on redemption of debt percentage | 6.00% |
Early redemption | 400 |
Premium paid on redemption of debt | 23 |
Accrued interest paid on redemption of debt | 8 |
Recognized net pre-tax loss | $ 32.0 |

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