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REVENUES - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Jan. 01, 2018
Revenue from Contract with Customer [Abstract] |  |  |  |
Current contract liabilities | $ 116.9 | $ 116.9 | $ 99.4 | $ 100.6
Noncurrent contract liabilities | 8.3 | 8.3 | $ 8.1 | $ 6.0
Deferred revenue recognized | $ 37.0 | $ 69.9 |  |
Capitalized Contract Cost [Line Items] |  |  |  |
Amortization period of capitalized contract costs | 7 years | 7 years |  |
Amortization of capitalized contract costs | $ 13.6 | $ 23.8 |  |
Obtain Contract |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |
Capitalized contract costs | 172.2 | 172.2 |  |
Fulfill Contract |  |  |  |
Capitalized Contract Cost [Line Items] |  |  |  |
Capitalized contract costs | $ 8.3 | $ 8.3 |  |

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- Definition Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer; classified as noncurrent. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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