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Property Plant and Equipment by Operating Segment (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]
Property, plant & equipment	$ 488.8	$ 482.2
United States
Segment Reporting Information [Line Items]
Property, plant & equipment	337.7	336.2
Canada
Segment Reporting Information [Line Items]
Property, plant & equipment	47.4	46.9
United Kingdom
Segment Reporting Information [Line Items]
Property, plant & equipment	94.6	89.8
Mexico
Segment Reporting Information [Line Items]
Property, plant & equipment	$ 9.1	$ 9.3

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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