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Commitments And Contingencies (Tables)
 3 Months Ended
Mar. 30, 2018
Commitments and Contingencies Disclosure [Abstract]  
Warranty Accrual
The following is a rollforward of the Company’s accrued warranty liability ($ in millions):
Balance, December 31, 2017
$
79.0

Accruals for warranties issued during the period
14.1

Settlements made
(16.3
)
Effect of foreign currency translation
0.9

Balance, March 30, 2018
$
77.7