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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, 2014
Dec. 31, 2013
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Other foreign loans, Carrying Amount $ 255.1 $ 85.0
Other domestic loans, Carrying Amount 393.3 0.4
Total debt, Carrying Amount 4,768.7 4,399.5
Other foreign loans, Fair Value 254.9 84.9
Other domestic loans, Fair Value 393.3 0.4
Total debt, Fair Value 5,036.4 4,599.1
12% Senior Notes Due February 2014 [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Senior Notes, Carrying Amount   150.3
Senior Notes, Fair Value   150.6
Term Loan A Facility Due October 2016 [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Credit Facility, Carrying Amount 638.5 684.5
Credit Facility, Fair Value 638.5 684.5
Term Loan B Facility Due October 2018 [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Credit Facility, Carrying Amount 681.7 681.6
Credit Facility, Fair Value 681.7 681.6
8.125% Senior Notes Due September 2019 [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Senior Notes, Carrying Amount 750.0 750.0
Senior Notes, Fair Value 831.9 841.4
6.50% Senior Notes Due December 2020 [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Senior Notes, Carrying Amount 426.5 424.1
Senior Notes, Fair Value 480.0 456.7
8.375% Senior Notes Due September 2021 [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Senior Notes, Carrying Amount 750.0 750.0
Senior Notes, Fair Value 860.0 853.1
5.25% Senior Notes Due April 2023 [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Senior Notes, Carrying Amount 425.0 425.0
Senior Notes, Fair Value 433.7 414.7
6.875% Senior Notes Due July 2033 [Member]
    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Senior Notes, Carrying Amount 448.6 448.6
Senior Notes, Fair Value $ 462.4 $ 431.2