Reportable Business Segment Information (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended						12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012 Metal Containers	Dec. 31, 2011 Metal Containers	Dec. 31, 2010 Closures	Dec. 31, 2012 Corporate	Dec. 31, 2011 Corporate	Dec. 31, 2010 Corporate
Segment Reporting Information [Line Items]
New plant start-up costs	$ 2.1	$ 1.4	$ 1.9	$ 1.0			$ 6.4
Costs attributable to announced acquisitions		0.8	0.7			1.8				1.5		2.7
Charge related to resolution of past product liability dispute					3.3			3.3
Income as result of proceeds received from termination of the Graham Packaging merger agreement net of costs					27.0						25.2
Charge included for the remeasurement of net assets									$ 3.2