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Organization and Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Schedule of Product Warranty Liability Activity | The following table presents the Company’s product warranty liability activity in 2017 and 2016:
Years ended December 31 (dollars in millions) |  | 2017 |  |  | 2016 |
Balance at beginning of year |  | $ | 140.9 |  |  | $ | 139.3 |
Expense |  |  | 39.7 |  |  |  | 42.5 |
Claims settled |  |  | (38.2 | ) |  |  | (40.9 | )
Balance at end of year |  | $ | 142.4 |  |  | $ | 140.9 |
Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis | Assets measured at fair value on a recurring basis are as follows (dollars in millions):
Fair Value Measurement Using |  | December 31, 2017 |  |  | December 31, 2016 |
Quoted prices in active markets for identical assets (Level 1) |  | $ | 475.1 |  |  | $ | 424.5 |
Schedule of Computation of Basic and Diluted Weighted Average Shares Used in EPS Calculations | The following table sets forth the computation of basic and diluted weighted-average shares used in the earnings per share calculations:
|  | 2017 |  |  | 2016 |  |  | 2015 |
Denominator for basic earnings per share - weighted-average shares outstanding |  |  | 172,666,056 |  |  |  | 174,712,683 |  |  |  | 177,622,280 |
Effect of dilutive stock options, restricted stock and share units |  |  | 1,939,133 |  |  |  | 2,112,597 |  |  |  | 1,386,900 |
Denominator for diluted earnings per share |  |  | 174,605,189 |  |  |  | 176,825,280 |  |  |  | 179,009,180 |

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + 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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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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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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