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Commitments and Contingencies (Tables)
 9 Months Ended
Sep. 28, 2018
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Accrued Warranty Liability The following is a rollforward of our accrued warranty liability ($ in millions):
Balance, December 31, 2017
$
69.4

Accruals for warranties issued during the period
56.8

Settlements made
(58.7
)
Additions due to acquisitions
0.2

Effect of foreign currency translation
(0.3
)
Balance, September 28, 2018
$
67.4