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Goodwill (Tables)
12 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Changes in Carrying Amounts of Goodwill The changes in the carrying amounts of goodwill were as follows:
 
Balance at December 31, 2018
$
96.5

HelloSign acquisition
133.0

Other acquisition
2.4

Effect of foreign currency translation
2.6

Balance at December 31, 2019
$
234.5