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Commitments and Contingencies (Tables)
 6 Months Ended
Jun. 29, 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
37.2

Settlements made
(39.4
)
Effect of foreign currency translation
(0.2
)
Balance, June 29, 2018
$
67.0