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1. Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2015
Accounting Policies [Abstract]  
Schedule of Product Warranty Liability

Changes in the warranty accrual, included in Other current liabilities and Other long-term liabilities, were as follows (in millions):
 
 
2015
 
2014
January 1
 
$
17.8

 
$
15.6

Provision for warranty
 
30.6

 
28.6

Actual warranty costs
 
(31.0
)
 
(26.4
)
December 31
 
$
17.4

 
$
17.8


Schedule of Weighted Average Number of Shares

The weighted average number of common shares outstanding used to calculate basic and diluted earnings per share and the anti-dilutive shares are as follows (in thousands):
 
 
Year Ended December 31,
 
 
2015
 
2014
 
2013
Basic weighted average shares outstanding
 
29,186

 
28,876

 
28,586

Effect of potentially dilutive stock options
 
 
 
 
 
 
    and restricted stock awards
 
223

 
257

 
320

Diluted weighted average common shares
 
29,409

 
29,133

 
28,906

Anti-dilutive stock options and restricted stock awards
 
 
 
 
 
 
    excluded from the computation of diluted EPS
 
109

 
122

 
107