Credit Losses (Tables)

12 Months Ended

Dec. 31, 2021

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, 2020	$	30.5
Foreign currency translation	(1.5)
Provision for credit losses	4.7
Write-offs charged against the allowance	(7.3)
Recoveries	(5.7)
Balance a December 31, 2021	$	20.7