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Fair Value Measurements and Other Financial Instruments - Carrying Amounts and Estimated Fair Values of Debt (Detail) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]    
Other foreign loans, Fair Value $ 80.3 $ 44.0
Other domestic loans, Fair Value 0.5 0.6
Fair Value 4,752.5 4,847.0
Credit facility amount outstanding, Carrying Value 76.3 39.2
Other foreign loans, Carrying Value 80.5 44.2
Other domestic loans, Carrying Value 0.6 0.6
Carrying Amount 4,581.6 4,581.8
12% Senior Notes due February 2014 [Member]
   
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]    
Senior Notes, Fair Value 160.0 172.0
Senior Notes, Carrying Value    153.4
Senior Notes, Carrying Value 151.9  
Term Loan A Facility due October 2016 [Member]
   
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]    
Credit facility amount outstanding, Fair Value 783.5 843.9
Credit facility amount outstanding, Carrying Value 783.5 843.9
7.875% Senior Notes due June 2017 [Member]
   
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]    
Senior Notes, Fair Value    424.8
Senior Notes, Carrying Value    394.5
Term Loan B Facility due October 2018 [Member]
   
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]    
Credit facility amount outstanding, Fair Value 766.5 771.6
Credit facility amount outstanding, Carrying Value 766.5 771.6
8.125% Senior Notes due September 2019 [Member]
   
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]    
Senior Notes, Fair Value 830.2 846.8
Senior Notes, Carrying Value 750.0 750.0
6.50% Senior Notes due December 2020 [Member]
   
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]    
Senior Notes, Fair Value 449.3 463.1
Senior Notes, Carrying Value 425.0 425.0
8.375% Senior Notes due September 2021 [Member]
   
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]    
Senior Notes, Fair Value 843.0 858.5
Senior Notes, Carrying Value 750.0 750.0
5.25% Senior Notes due April 2023 [Member]
   
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]    
Senior Notes, Fair Value 410.0   
Senior Notes, Carrying Value 425.0   
6.875% Senior Notes due July 2033 [Member]
   
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]    
Senior Notes, Fair Value 429.2 421.7
Senior Notes, Carrying Value $ 448.6 $ 448.6