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

Aggregate value of debt redeemed.

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Debt instrument early repayment interest.

+ References

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Premium paid on redemption of debt.

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No definition available.

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Premium paid on redemption of debt percentage.

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No definition available.

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Senior notes maturity date.

+ References

No definition available.

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- Definition

The stated principal amount of the debt instrument at time of issuance, which may vary from the carrying amount because of unamortized premium or discount.

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Interest rate stated in the contractual debt agreement.

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- Definition

The cash outflow for the extinguishment of long-term borrowing, with the highest claim on the assets of the entity in case of bankruptcy or liquidation, before its maturity.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Description of the frequency of periodic payments, which may be presented in a variety of ways (for example, monthly, quarterly, annually).

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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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