Fair Value Measurements and Other Financial Instruments - Carrying Amounts and Estimated Fair Values of Debt (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Credit Facility, Carrying Amount	$ 276.0	$ 0
Other foreign loans, Carrying Amount	57.0	85.0
Other domestic loans, Carrying Amount	363.3	0.4
Total debt, Carrying Amount	4,616.0	4,399.5
Other foreign loans, Fair Value	56.8	84.9
Other domestic loans, Fair Value	363.3	0.4
Total debt, Fair Value	4,797.1	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 July 2019 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Credit Facility, Carrying Amount	1,146.7	684.5
Credit Facility, Fair Value	1,146.7	684.5
Term Loan A Facility Due July 2017 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Credit Facility, Carrying Amount	249.7
Credit Facility, Fair Value	249.7
Term Loan B Facility Noncurrent [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Credit Facility, Carrying Amount		681.6
Credit Facility, Fair Value		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	808.7	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	425.6	424.1
Senior Notes, Fair Value	455.9	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	834.4	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	419.6	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	448.7	448.6
Senior Notes, Fair Value	$ 462.0	$ 431.2