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Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2018
Goodwill [Abstract]. |
Schedule of Changes in the Carrying Amount of Goodwill | Changes in the carrying amount of the Company’s goodwill for the years ended December 31, 2018 and 2017 were as follows:
|  | 2018 |  | 2017
|  | (U.S. $ in millions)
Balance at January 1, |  | $ | 387.1 |  |  | $ | 385.6
Currency translation adjustments and disposition |  |  | (1.3 | ) |  |  | 1.5
Balance at December 31, |  | $ | 385.8 |  |  | $ | 387.1

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13854-109267 + Details
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