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1. Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2017
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):
 
 
2017
 
2016
January 1
 
$
17.6

 
$
17.4

Provision for warranty
 
29.9

 
33.4

Actual warranty costs
 
(28.8
)
 
(33.2
)
December 31
 
$
18.7

 
$
17.6


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,
 
 
2017
 
2016
 
2015
Basic weighted average shares outstanding
 
29,655

 
29,440

 
29,186

Effect of potentially dilutive stock options
 
 
 
 
 
 
    and restricted stock awards
 
379

 
206

 
223

Diluted weighted average common shares
 
30,034

 
29,646

 
29,409

Anti-dilutive stock options and restricted stock awards
 
 
 
 
 
 
    excluded from the computation of diluted EPS
 
13

 
113

 
109