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LONG-TERM DEBT - Credit Facility (Details) - Credit Facility - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Oct. 26, 2016
Credit Facility |  |  |
Outstanding borrowings | $ 0.0 | $ 0.0 |
Credit Facility availability | $ 1,199.2 | $ 1,199.2 | $ 1,200.0
Minimum |  |  |
Credit Facility |  |  |
Standby fee (in percent) | 0.29% |  |
Maximum |  |  |
Credit Facility |  |  |
Standby fee (in percent) | 0.55% |  |

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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