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Debt and Credit Facilities - Total Debt Outstanding (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Term Loan A Facility Noncurrent [Member]
Dec. 31, 2012
Term Loan A Facility Noncurrent [Member]
Dec. 31, 2013
Term Loan B Facility Noncurrent [Member]
Dec. 31, 2012
Term Loan B Facility Noncurrent [Member]
Dec. 31, 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]
Dec. 31, 2013
12% Senior Notes Due February 2014 [Member]
Dec. 31, 2012
12% Senior Notes Due February 2014 [Member]
Dec. 31, 2011
12% Senior Notes Due February 2014 [Member]
Dec. 31, 2013
7.875% Senior Notes Due June 2017 [Member]
Dec. 31, 2012
7.875% Senior Notes Due June 2017 [Member]
Dec. 31, 2013
8.125% Senior Notes Due September 2019 [Member]
Dec. 31, 2012
8.125% Senior Notes Due September 2019 [Member]
Dec. 31, 2013
6.50% Senior Notes Due December 2020 [Member]
Dec. 31, 2012
6.50% Senior Notes Due December 2020 [Member]
Nov. 30, 2012
6.50% Senior Notes Due December 2020 [Member]
Dec. 31, 2013
8.375% Senior Notes Due September 2021 [Member]
Dec. 31, 2012
8.375% Senior Notes Due September 2021 [Member]
Dec. 31, 2013
6.875% Senior Notes Due July 2033 [Member]
Dec. 31, 2012
6.875% Senior Notes Due July 2033 [Member]
Dec. 31, 2013
Term Loan A Facility [Member]
Dec. 31, 2013
Term Loan B Facility [Member]
Dec. 31, 2012
Term Loan B Facility [Member]
Dec. 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% 5.25% 12.00% 12.00% 12.00% 7.875% 7.875% 8.125% 8.125% 6.50% 6.50% 6.50% 8.375% 8.375% 6.875% 6.875%          
Unamortized lender fees       $ 8.4 $ 15.4 $ 7.3 $ 10.7                                            
Unamortized discount                             5.5               1.4 1.4     2.0 10.8 15.6
Repurchase aggregate principal amount                           0                              
Weighted average interest rate 6.20% 6.20%                                                      
Current portion of long term debt 201.5 1.8                                             50.0        
Payments of long-term debt $ 658.3 $ 1,759.1 $ 1,753.6                                           $ 152.0 $ 105.0