Geographic Information on Certain Long-Lived Assets (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Revenues from External Customers and Long-Lived Assets [Line Items]
Certain Long-Lived Assets	$ 10,481.9	$ 10,374.6	$ 9,071.8
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Certain Long-Lived Assets	2,953.1	3,178.8	2,907.2
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Certain Long-Lived Assets	3,493.4	3,028.8	2,324.6
Malaysia
Revenues from External Customers and Long-Lived Assets [Line Items]
Certain Long-Lived Assets	3,154.8	2,807.0	2,714.9
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Certain Long-Lived Assets	694.7	706.3	704.7
Republic of the Congo
Revenues from External Customers and Long-Lived Assets [Line Items]
Certain Long-Lived Assets	133.7	579.4	399.9
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Certain Long-Lived Assets	$ 52.2	$ 74.3	$ 20.5