Fair Value Measurements and Other Financial Instruments - Carrying Amounts and Estimated Fair Values of Debt (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Credit facility amount outstanding	$ 685.0	$ 81.6
Other foreign loans, Carrying Amount	215.1	85.0
Other domestic loans, Carrying Amount	473.4	0.4
Total debt, Carrying Amount	4,806.1	4,399.5
Other foreign loans, Fair Value	215.1	84.9
Other domestic loans, Fair Value	473.4	0.4
Total debt, Fair Value	5,061.3	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 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Credit facility amount outstanding	636.6	684.5
Credit facility amount outstanding, Fair Value	636.6	684.5
Term Loan B Facility [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Credit facility amount outstanding	682.4	681.6
Credit facility amount outstanding, Fair Value	682.4	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	838.4	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	425.0	424.1
Senior Notes, Fair Value	469.1	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	863.3	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	429.3	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	$ 453.7	$ 431.2