Goodwill

The amounts for goodwill and changes to carrying value by reportable segment are as follows:



(millions) (unaudited)	Region One			Region Two		Total
Balance as of December 31, 2017	$	369.0		$	62.7	$	431.7
Foreign currency translation	(0.1		)	—		(0.1		)
Balance as of September 30, 2018	$	368.9		$	62.7	$	431.6

The Company tests goodwill at least annually for impairment (the Company has elected to annually test for potential impairment of goodwill on the first day of the fourth quarter) and tests more frequently if indicators are present or changes in circumstances suggest that impairment may exist. The indicators include, among others, declines in sales, earnings or cash flows or the development of a material adverse change in business climate. The Company assesses goodwill for impairment at the reporting unit level, which is defined as an operating segment or one level below an operating segment, referred to as a component.

The Company completed its annual goodwill impairment test as of October 1, 2017, using a qualitative test (Step Zero), to determine the likelihood of impairment and if it was more likely than not that the fair value of the reporting units were less than the carrying value of the reporting unit. The Company concluded that the estimated fair values of each of the Company's reporting units exceeded its carrying amount of net assets assigned to that reporting unit and, therefore, no further testing was required (Step One). Generally, the more-likely-than-not threshold is a greater than a 50% likelihood that the fair value of a reporting unit is greater than the carrying value. As part of the October 1, 2017 goodwill assessment, the Company engaged a third-party to estimate a discount rate, which is a primary driver in the valuation of the Company's reporting units' fair values. No impairment was recorded as a result of the goodwill impairment test performed. The Company monitors for indicators for goodwill impairment testing between annual tests. No adverse events occurred during the three and nine months ended September 30, 2018 that would cause the Company to test goodwill for impairment.