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1. Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2018
Accounting Policies [Abstract] |
Schedule of Product Warranty Liability | We warrant certain equipment against defects in design, materials and workmanship, generally for a period of one year. Upon revenue recognition of that equipment, we establish, as part of Cost of goods sold, a provision for the expected costs of such warranty based on historical experience, specific warranty terms and customer feedback. A review is performed on a quarterly basis to assess the adequacy of our warranty accrual. Components of the warranty accrual, included in Other current liabilities and Other long-term liabilities in the Consolidated Balance Sheets, were as follows (in millions):
|  | 2018 |  | 2017
January 1 |  | $ | 18.7 |  |  | $ | 17.6 |
Provision for warranty |  | 25.5 |  |  | 29.9 |
Actual warranty costs |  | (34.1 | ) |  | (28.8 | )
December 31 |  | $ | 10.1 |  |  | $ | 18.7 |
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,
|  | 2018 |  | 2017 |  | 2016
Basic weighted average shares outstanding |  | 29,836 |  |  | 29,655 |  |  | 29,440 |
Effect of potentially dilutive stock options |  |  |  |  |  |
and restricted stock awards |  | 392 |  |  | 379 |  |  | 206 |
Diluted weighted average common shares |  | 30,228 |  |  | 30,034 |  |  | 29,646 |
Anti-dilutive stock options and restricted stock awards |  |  |  |  |  |
excluded from the computation of diluted EPS |  | 84 |  |  | 13 |  |  | 113 |

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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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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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