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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2018
Fair Value Disclosures [Abstract] |
Schedule of Assets and Liabilities Measured at Fair Value | The following tables present the assets and liabilities recorded at fair value on a recurring basis:
| Balance at |  | Basis of Fair Value Measurements
($ in millions) | June 30, 2018 |  | Level 1 |  | Level 2 |  | Level 3
Assets: |  |  |  |  |  |  |
Deferred compensation assets | $ | 8.8 |  |  | $ | 8.8 |  |  | $ | — |  |  | $ | — |
Foreign currency contracts | 3.4 |  |  | — |  |  | 3.4 |  |  | — |
| $ | 12.2 |  |  | $ | 8.8 |  |  | $ | 3.4 |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |  |  |  |  |
Contingent consideration | $ | 5.0 |  |  | $ | — |  |  | $ | — |  |  | $ | 5.0 |
Deferred compensation liabilities | 9.9 |  |  | 9.9 |  |  | — |  |  | — |
Foreign currency contracts | 8.0 |  |  | — |  |  | 8.0 |  |  | — |
| $ | 22.9 |  |  | $ | 9.9 |  |  | $ | 8.0 |  |  | $ | 5.0 |
| Balance at |  | Basis of Fair Value Measurements
($ in millions) | December 31, 2017 |  | Level 1 |  | Level 2 |  | Level 3
Assets: |  |  |  |  |  |  |
Deferred compensation assets | $ | 8.9 |  |  | $ | 8.9 |  |  | $ | — |  |  | $ | — |
Foreign currency contracts | 0.5 |  |  | — |  |  | 0.5 |  |  | — |
| $ | 9.4 |  |  | $ | 8.9 |  |  | $ | 0.5 |  |  | $ | — |
Liabilities: |  |  |  |  |  |  |  |  |  |  |
Contingent consideration | $ | 4.9 |  |  | $ | — |  |  | $ | — |  |  | $ | 4.9 |
Deferred compensation liabilities | 9.9 |  |  | 9.9 |  |  | — |  |  | — |
Foreign currency contracts | 5.1 |  |  | — |  |  | 5.1 |  |  | — |
| $ | 19.9 |  |  | $ | 9.9 |  |  | $ | 5.1 |  |  | $ | 4.9 |
Summary of Changes in Level 3 Fair Value Measurements | The following table provides a summary of changes in our Level 3 fair value measurements:
| ($ in millions)
Balance, December 31, 2016 | $ | 8.0 |
Decrease in fair value recorded in earnings | (2.4 | )
Payments | (0.7 | )
Balance, December 31, 2017 | 4.9 |
Increase in fair value recorded in earnings | 0.6 |
Payments | (0.5 | )
Balance, June 30, 2018 | $ | 5.0 |

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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + 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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