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Accounts Receivable and Allowance for Doubtful Accounts (Tables)
 12 Months Ended
Dec. 31, 2019
Receivables [Abstract]  
Schedule of Allowance for Doubtful Accounts
Movements in the allowance for doubtful accounts are as follows (in millions):

 
Year Ended December 31,
 
2019
 
2018
Beginning balance
$
1.1

 
$
0.4

Provision (recoveries)
3.1

 
0.7

Write-offs
(1.4
)
 
—

Ending balance
$
2.8

 
$
1.1