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Fair Value Measurements and Other Financial Instruments - Carrying Amounts and Estimated Fair Values of Debt (Detail) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Credit Facility, Carrying Amount   $ 23.0
Other foreign loans, Carrying Amount $ 95.2 73.9
Other foreign loans, Fair Value 95.3 73.8
Other domestic loans, Carrying Amount 2.8 59.2
Other domestic loans, Fair Value 3.2 59.2
Total debt, Carrying Amount 4,463.3 4,414.0
Total debt, Fair Value 4,517.5 4,569.4
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 427.9 428.1
Senior Notes, Fair Value 473.6 469.7
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
Senior Notes, Fair Value   843.3
4.875% Senior Notes due December 2022 [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 419.2 423.3
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 428.0 429.6
4.50% Senior Notes due September 2023 [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Senior Notes, Carrying Amount 449.5  
Senior Notes, Fair Value 455.5  
5.125% Senior Notes due December 2024 [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 419.7 428.5
5.50% Senior Notes due September 2025 [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Senior Notes, Carrying Amount 400.0  
Senior Notes, Fair Value 403.7  
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 448.7 448.7
Senior Notes, Fair Value 455.1 462.9
Term Loan A Due July 2017 [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Credit Facility, Carrying Amount 249.7 249.7
Credit Facility, Fair Value 249.7 249.7
Term Loan A Due July 2019 [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Credit Facility, Carrying Amount 1,114.5 1,129.4
Credit Facility, Fair Value $ 1,114.5 $ 1,129.4