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Goodwill (Tables)
6 Months Ended
Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Changes in Carrying Value of Goodwill
Changes in the carrying amount of goodwill for the six months ended June 30, 2020 were (in millions):

Goodwill
Balance as of December 31, 2019
$253.2  
Acquisitions126.6  
Balance as of June 30, 2020
$379.8