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Credit Losses (Tables)
 3 Months Ended
Apr. 03, 2020
Credit Loss [Abstract]  
Allowance for Credit Losses
The rollforward of the allowance for credit losses is summarized as follows ($ in millions):

Balance at December 31, 2019
$
22.8

Foreign currency translation
(1.4
)
Provision for credit losses
6.1

Write-offs charged against the allowance
(0.9
)
Balance at April 3, 2020
$
26.6