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Commitments and Contingencies (Tables)
 3 Months Ended
Mar. 31, 2017
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, 2016
$
65.0

Accruals for warranties issued during the period
17.6

Settlements made
(17.4
)
Balance, March 31, 2017
$
65.2