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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
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