Fair Value Measurements and Other Financial Instruments - Carrying Amounts and Estimated Fair Values of Debt (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]
Other foreign loans fair value	$ 44.0	$ 37.4
Other domestic loans fair value	0.6	1.3
Fair Value	4,847.0	5,163.8
Credit facility amount outstanding	39.2	34.5
Other foreign loans carrying amount	44.2	37.8
Other domestic loans carrying amount	0.6	1.4
Carrying Amount	4,581.8	5,003.1
5.625 % Senior Notes due July 2013 [Member]
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]
Senior notes fair value		414.1
Senior Notes		401.0
12% Senior Notes due February 2014 [Member]
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]
Senior notes fair value	172.0	179.8
Senior Notes	153.4	156.3
Term Loan A Facility due October 2016 [Member]
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]
Credit facility amount outstanding fair value	843.9	945.7
Credit facility amount outstanding	843.9	945.7
7.875% Senior Notes due June 2017 [Member]
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]
Senior notes fair value	424.8	426.0
Senior Notes	394.5	393.5
Term Loan B Facility due October 2018 [Member]
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]
Credit facility amount outstanding fair value	771.6	1,118.8
Credit facility amount outstanding	771.6	1,118.8
8.125% Senior Notes due September 2019 [Member]
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]
Senior notes fair value	846.8	824.5
Senior Notes	750.0	750.0
6.50% Senior Notes due December 2020 [Member]
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]
Senior notes fair value	463.1
Senior Notes	425.0
8.375% Senior Notes due September 2021 [Member]
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]
Senior notes fair value	858.5	826.9
Senior Notes	750.0	750.0
6.875% Senior Notes due July 2033 [Member]
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]
Senior notes fair value	421.7	389.3
Senior Notes	$ 448.6	$ 448.6