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5. Product Warranty Liability (Tables)
6 Months Ended
Jun. 30, 2017
Product Warranties Disclosures [Abstract]  
Components of warranty accrual Components of the warranty accrual, included in Other current liabilities and Other long-term liabilities in the Condensed Consolidated Balance Sheets, were as follows (in millions):

January 1, 2017
$
17.6

Provision for warranty
13.9

Actual warranty costs
(13.8
)
June 30, 2017
$
17.7