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Fair Value Measurements (Tables) | 9 Months Ended | 12 Months Ended
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Sep. 30, 2018 | Dec. 31, 2017
Fair Value Disclosures [Abstract] |  |
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis | As of September 30, 2018, our financial assets and liabilities measured at fair value on a recurring basis were categorized as follows:
|  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for sale customer trust funds assets |  | $ | 1,720.1 |  |  | $ | — |  |  | $ | 1,720.1 | (a) |  | $ | — |
Total assets measured at fair value |  | $ | 1,720.1 |  |  | $ | — |  |  | $ | 1,720.1 |  |  | $ | — |
As of December 31, 2017, our financial assets and liabilities measured at fair value on a recurring basis were categorized as follows:
|  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for sale customer trust funds assets |  | $ | 1,782.1 |  |  | $ | — |  |  | $ | 1,782.1 | (a) |  | $ | — |
Total assets measured at fair value |  | $ | 1,782.1 |  |  | $ | — |  |  | $ | 1,782.1 |  |  | $ | — |
(a) | Fair value is based on inputs that are observable for the asset or liability, other than quoted prices.
| As of December 31, 2017, our financial assets and liabilities measured at fair value on a recurring basis were categorized as follows:
|  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for sale customer trust funds assets |  | $ | 1,782.1 |  |  | $ | — |  |  | $ | 1,782.1 | (a) |  | $ | — |
Total assets measured at fair value |  | $ | 1,782.1 |  |  | $ | — |  |  | $ | 1,782.1 |  |  | $ | — |
As of December 31, 2016, our financial assets and liabilities measured at fair value on a recurring basis were categorized as follows:
|  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for sale customer trust funds assets |  | $ | 1,755.4 |  |  | $ | — |  |  | $ | 1,755.4 | (a) |  | $ | — |
Total assets measured at fair value |  | $ | 1,755.4 |  |  | $ | — |  |  | $ | 1,755.4 |  |  | $ | — |
(a) | Fair value is based on inputs that are observable for the asset or liability, other than quoted prices.

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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