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Goodwill (Tables)
 9 Months Ended
Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Changes in the Carrying Amount of Goodwill by Reporting Segment
The changes in the carrying amount of goodwill by reportable segment were as follows (in millions):
 ATMFBSTotal
Balance at December 31, 2022
$842.6 $1.6 $844.2 
Goodwill acquired during the period(1)
16.0 — 16.0 
Goodwill impairment(401.0)— (401.0)
Foreign currency translation8.8 — 8.8 
Balance at September 30, 2023
$466.4 $1.6 $468.0 
(1) Related to the measurement period adjustments for the Merger.