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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
Mar. 31, 2013
Dec. 31, 2012
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]    
Other foreign loans, Fair Value $ 81.3 $ 44.0
Other domestic loans, Fair Value 0.6 0.6
Fair Value 4,855.2 4,847.0
Credit facility amount outstanding, Carrying Value 77.0 39.2
Other foreign loans, Carrying Value 81.5 44.2
Other domestic loans, Carrying Value 0.6 0.6
Carrying Amount 4,607.9 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 164.0 172.0
Senior Notes, Carrying Value   153.4
Senior Notes, Carrying Value 152.7  
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 810.3 843.9
Credit facility amount outstanding, Carrying Value 810.3 843.9
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 764.2 771.6
Credit facility amount outstanding, Carrying Value 764.2 771.6
8.125% Senior Notes due September 2019 [Member]
   
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]    
Senior Notes, Fair Value 850.8 846.8
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 464.4 463.1
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 860.4 858.5
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 425.7  
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 433.5 421.7
Senior Notes, Carrying Value $ 448.6 $ 448.6