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1. Significant Accounting Policies (Tables) | 12 Months Ended
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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 |

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- Definition Tabular disclosure of the changes in the guarantor's aggregate product warranty liability, including the beginning balance of the aggregate product warranty liability, the aggregate reductions in that liability for payments made (in cash or in kind) under the warranty, the aggregate changes in the liability for accruals related to product warranties issued during the reporting period, the aggregate changes in the liability for accruals related to preexisting warranties (including adjustments related to changes in estimates), and the ending balance of the aggregate product warranty liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 + Details
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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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