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Derivative Financial Instruments and Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of fair value measurements | The fair value measurements of those items recorded in our Consolidated Balance Sheets as of September 30, 2018 and December 31, 2017 were as follows:
|  |  | Fair Value Measurements Using
| September 30, 2018 |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Assets |  |  |  |  |  |  |
Deferred compensation plan assets | $ | 101.6 |  |  | $ | 101.6 |  |  | $ | — |  |  | $ | — |
Foreign currency forward contracts | 0.1 |  |  | — |  |  | 0.1 |  |  | — |
| $ | 101.7 |  |  | $ | 101.6 |  |  | $ | 0.1 |  |  | $ | — |
|  |  | Fair Value Measurements Using
| December 31, 2017 |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
Assets |  |  |  |  |  |  |
Deferred compensation plan assets | $ | 99.1 |  |  | $ | 99.1 |  |  | $ | — |  |  | $ | — |
| $ | 99.1 |  |  | $ | 99.1 |  |  | $ | — |  |  | $ | — |
Liabilities |  |  |  |  |  |  |
Foreign currency forward contracts | $ | 0.1 |  |  | $ | — |  |  | $ | 0.1 |  |  | $ | — |
| $ | 0.1 |  |  | $ | — |  |  | $ | 0.1 |  |  | $ | — |

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13476-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75026489&loc=d3e13220-108610 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 + Details
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