Credit Losses (Tables)

12 Months Ended

Dec. 31, 2020

Credit Loss [Abstract]

Allowance for Credit Loss

The rollforward of the allowance for credit losses is summarized as follows ($ in millions):

Balance at December 31, 2019	$	22.8
Foreign currency translation	0.4
Provision for credit losses	23.0
Write-offs charged against the allowance	(9.1)
Balance at December 31, 2020	$	37.1