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LONG-TERM DEBT - Surety Bonds, Letters of Credit and Guarantees (Narrative) (Details) $ in Millions	Dec. 31, 2017 USD ($)
Surety bonds
Guarantor Obligations [Line Items]
Outstanding surety bonds, commercial standby letters of credit and bank guarantees	$ 73.5
Commercial standby letters of credit
Guarantor Obligations [Line Items]
Outstanding surety bonds, commercial standby letters of credit and bank guarantees	164.2
Bank guarantees
Guarantor Obligations [Line Items]
Outstanding surety bonds, commercial standby letters of credit and bank guarantees	37.3
Cash secured bank guarantees
Guarantor Obligations [Line Items]
Outstanding surety bonds, commercial standby letters of credit and bank guarantees	17.6
Letters of credit collateralized
Guarantor Obligations [Line Items]
Outstanding surety bonds, commercial standby letters of credit and bank guarantees	$ 25.4

X

- Definition

The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248

+ Details

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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X

- Details

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- Details

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- Details

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- Details

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