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Accounts Receivable and Allowance for Doubtful Accounts (Tables)
 9 Months Ended
Sep. 30, 2019
Receivables [Abstract]  
Schedule of Allowance for Doubtful Accounts
Movements in the allowance for doubtful accounts are as follows (in millions):

 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2019
 
2018
 
2019
 
2018
Beginning balance
$
2.1

 
$
0.6

 
$
1.1

 
$
0.4

Provision (recoveries)
1.3

 
0.3

 
2.5

 
0.5

Write-offs
(0.6
)
 
—

 
(0.8
)
 
—

Ending balance
$
2.8

 
$
0.9

 
$
2.8

 
$
0.9