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Fair Value Measurements and Other Financial Instruments - Carrying Amounts and Estimated Fair Values of Debt (Detail)
€ in Millions, $ in Millions
Dec. 31, 2015
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2015
EUR (€)
Dec. 31, 2014
USD ($)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]        
Other foreign loans, Carrying Amount $ 165.7     $ 73.9
Other foreign loans, Fair Value 165.8     73.8
Other domestic loans, Carrying Amount 81.7     71.5
Other domestic loans, Fair Value 81.9     71.5
Total debt, Carrying Amount 4,591.2     4,426.3
Total debt, Fair Value 4,692.5     4,581.7
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 427.6     428.1
Senior Notes, Fair Value 473.7     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 426.5     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 436.2     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 437.3   € 400  
Senior Notes, Fair Value 452.7      
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 427.6     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 $ 400.0    
Senior Notes, Fair Value 410.2      
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 462.7     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 249.8     249.7
Credit Facility, Fair Value 249.8     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 1,105.4     1,129.4
Credit Facility, Fair Value $ 1,105.4     $ 1,129.4