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Goodwill (Tables)
 12 Months Ended
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”).