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Goodwill (Tables)
12 Months Ended
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in Carrying Amount of Goodwill by Segment
Changes in the carrying amount of goodwill by segment were as follows:
TotalServicesTechnology
Balance at December 31, 2018$111.0 $10.9 $100.1 
Translation adjustments(0.6)(0.6)— 
Balance at December 31, 2019110.4 10.3 100.1 
Translation adjustments(1.8) (1.8)
Balance at December 31, 2020$108.6 $10.3 $98.3