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Goodwill (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of changes in carrying amount of goodwill by business segment | The changes in the carrying amount of goodwill are as follows (in millions):
Balance at December 31, 2015 | $ | 678.4 |
Goodwill acquired(a) | 84.1 |
Currency translation adjustment | (0.2 | )
Balance at December 31, 2016 | 762.3 |
Currency translation adjustment | 2.4 |
Balance at December 31, 2017 | $ | 764.7 |
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(a) | We acquired $84 million of goodwill in conjunction with our acquisition of Corpak (see Note 6, “Business Acquisition”).

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- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
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