Geographic Information on Certain Long-Lived Assets (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenues from External Customers and Long-Lived Assets [Line Items]
Certain Long-Lived Assets	$ 13,217.4	$ 10,481.9	$ 10,374.6
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Certain Long-Lived Assets	4,177.4	2,953.1	3,178.8
Canada
Revenues from External Customers and Long-Lived Assets [Line Items]
Certain Long-Lived Assets	4,190.5	3,493.4	3,028.8
Malaysia
Revenues from External Customers and Long-Lived Assets [Line Items]
Certain Long-Lived Assets	4,101.2	3,154.8	2,807.0
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Certain Long-Lived Assets	703.2	694.7	706.3
Republic of the Congo
Revenues from External Customers and Long-Lived Assets [Line Items]
Certain Long-Lived Assets	5.9	133.7	579.4
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Certain Long-Lived Assets	$ 39.2	$ 52.2	$ 74.3