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Goodwill
12 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill
Goodwill
Goodwill represents the excess of the purchase price in a business combination over the fair value of net tangible and intangible assets acquired. Goodwill amounts are not amortized, but tested for impairment on an annual basis. There was no impairment of goodwill as of December 31, 2018 and 2017. Goodwill consisted of the following:
 
Balance at December 31, 2016
$
96.0

Effect of foreign currency translation
2.9

Balance at December 31, 2017
98.9

Effect of foreign currency translation
(2.4
)
Balance at December 31, 2018
$
96.5