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v3.19.1

REVENUE (Tables) | 3 Months Ended
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Mar. 31, 2019
Revenue from Contract with Customer [Abstract] |
Contract with Customer, Asset and Liability | The table below summarizes our deferred revenue balances:
| (In Millions)
| Deferred Revenue (Current) |  | Deferred Revenue (Long-Term)
| 2019 |  | 2018 |  | 2019 |  | 2018
Opening balance as of January 1 | $ | 21.0 |  |  | $ | 23.8 |  |  | $ | 38.5 |  |  | $ | 51.4 |
Closing balance as of March 31 | 18.1 |  |  | 31.0 |  |  | 38.5 |  |  | 51.4 |
Increase (decrease) | $ | (2.9 | ) |  | $ | 7.2 |  |  | $ | — |  |  | $ | — |

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- Definition Tabular disclosure of contract balances and changes in contract balances. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130551-203045 + Details
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- References No definition available. + Details
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