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Debt and Credit Facilities - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended |  | 6 Months Ended |  |  | 3 Months Ended
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Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012 | Jun. 30, 2013 5.25% Senior Notes due April 2023 [Member] | Mar. 31, 2013 5.25% Senior Notes due April 2023 [Member] | Dec. 31, 2012 5.25% Senior Notes due April 2023 [Member] | Mar. 31, 2013 7.875% Senior Notes due June 2017 [Member]
Debt Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  | $ 425 |  |
Debt interest rate |  |  |  |  |  | 5.25% | 5.25% | 5.25% | 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 | (0.1) |  | (32.4) |  |  |  |  |  | 32.0
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. |  |  |
Short-term borrowings | $ 76.3 |  | $ 76.3 |  | $ 39.2 |  |  |  |

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