9. Goodwill

($ in millions)	Metal Beverage Packaging, Americas & Asia		Metal Beverage Packaging, Europe		Metal Food & Household Products Packaging			Aerospace & Technologies		Total

Balance at December 31, 2012	$	740.7	$	993.2	$	625.5		$	—	$	2,359.4
Business acquisitions and related opening balance sheet adjustments	—		—		(15.1		)	8.6		(6.5		)
Effects of currency exchange rates	—		23.0		3.9			—		26.9
Balance at September 30, 2013	$	740.7	$	1,016.2	$	614.3		$	8.6	$	2,379.8

On January 1, 2013, the company implemented changes to its management and internal reporting structure. As a result, the European extruded aluminum reporting unit, which was previously included in the metal beverage packaging, Europe, segment, is now included in the metal food and household products packaging segment. Goodwill by segment has been retrospectively adjusted to conform to the current year presentation.