Fair Value Measurements and Other Financial Instruments - Carrying Amounts and Estimated Fair Values of Debt (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]
Credit facility amount outstanding	$ 75.2		$ 39.2
Other foreign loans, Carrying Value	79.1		44.2
Other domestic loans, Carrying Value	0.4		0.6
Carrying Amount	4,590.4		4,581.8
Other foreign loans, Fair Value	78.9		44.0
Other domestic loans, Fair Value	0.4		0.6
Fair Value	4,746.7		4,847.0
12% Senior Notes due February 2014
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]
Senior Notes, Carrying Value	151.1		153.4
Senior Notes, Fair Value	156.6		172.0
Term Loan A Facility due October 2016
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]
Credit facility amount outstanding	786.9	[1]	843.9	[1]
Credit facility amount outstanding, Fair Value	786.9	[1]	843.9	[1]
7.875% Senior Notes due June 2017
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]
Senior Notes, Carrying Value			394.5
Senior Notes, Fair Value			424.8
Term Loan B Facility due October 2018
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]
Credit facility amount outstanding	774.3	[1]	771.6	[1]
Credit facility amount outstanding, Fair Value	774.3	[1]	771.6	[1]
8.125% Senior Notes due September 2019
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]
Senior Notes, Carrying Value	750.0		750.0
Senior Notes, Fair Value	837.2		846.8
6.50% Senior Notes due December 2020
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]
Senior Notes, Carrying Value	425.0		425.0
Senior Notes, Fair Value	445.3		463.1
8.375% Senior Notes due September 2021
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]
Senior Notes, Carrying Value	750.0		750.0
Senior Notes, Fair Value	842.8		858.5
5.25% Senior Notes due April 2023
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]
Senior Notes, Carrying Value	425.0
Senior Notes, Fair Value	404.3
6.875% Senior Notes due July 2033
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]
Senior Notes, Carrying Value	448.6		448.6
Senior Notes, Fair Value	$ 420.0		$ 421.7

[1] Includes borrowings denominated in currencies other than U.S. dollars.