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Goodwill (Tables)
9 Months Ended
Sep. 25, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
The following is a rollforward of our carrying value of goodwill ($ in millions):

Balance, December 31, 2019$1,157.8 
Impairment charge(85.3)
FX translation & other(13.8)
Balance, September 25, 2020$1,058.7