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Debt and Credit Facilities - Total Debt Outstanding (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
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
12% Senior Notes due February 2014 [Member]
Dec. 31, 2012
12% Senior Notes due February 2014 [Member]
Sep. 30, 2012
12% Senior Notes due February 2014 [Member]
Mar. 31, 2013
7.875% Senior Notes due June 2017 [Member]
Dec. 31, 2012
7.875% Senior Notes due June 2017 [Member]
Mar. 31, 2013
8.125% Senior Notes due September 2019 [Member]
Dec. 31, 2012
8.125% Senior Notes due September 2019 [Member]
Mar. 31, 2013
6.50% Senior Notes due December 2020 [Member]
Dec. 31, 2012
6.50% Senior Notes due December 2020 [Member]
Mar. 31, 2013
8.375% Senior Notes due September 2021 [Member]
Dec. 31, 2012
8.375% Senior Notes due September 2021 [Member]
Mar. 31, 2013
6.875% Senior Notes due July 2033 [Member]
Dec. 31, 2012
6.875% Senior Notes due July 2033 [Member]
Mar. 31, 2013
Term Loan A Facility [Member]
Mar. 31, 2013
Term Loan B Facility due October 2018 [Member]
Mar. 31, 2013
Term Loan A Facility due October 2016 [Member]
Dec. 31, 2012
Term Loan A Facility due October 2016 [Member]
Mar. 31, 2013
Term Loan B Facility due October 2018 [Member]
Dec. 31, 2012
Term Loan B Facility due October 2018 [Member]
Debt Instrument [Line Items]                                                
Debt interest rate       5.25% 5.25% 12.00% 12.00% 12.00% 7.875% 7.875% 8.125% 8.125% 6.50% 6.50% 8.375% 8.375% 6.875% 6.875%            
Unamortized lender fees                                         $ 13.6 $ 15.4 $ 10.1 $ 10.7
Unamortized discount                    5.5             1.4 1.4         14.8 15.6
Payments of long-term debt 428.0 27.3                                 26.0 2.0        
Repurchase aggregate principal amount                 $ 400                              
Weighted average interest rate 6.20%   6.40%