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FINANCING ARRANGEMENTS (Narrative) (Details) - USD ($) |  | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 01, 2017 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2017 | Mar. 14, 2016 | Dec. 07, 2012 | Jul. 30, 2012
Financing arrangements |  |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment, Percentage of Face Amount |  |  | 0.25% |  |  |  |  |  |
Revolving credit facility, available borrowing capacity |  |  | $ 217,800,000 | $ 195,200,000 |  |  |  |  |
Letters of credit outstanding, amount |  |  | 134,100,000 | 132,600,000 |  |  |  |  |
Premiums to repay debt early |  |  | $ 6,028,000 | 0 | $ 0 |  |  |  |
Parent and Domestic Subsidiaries |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Credit available subject to percentage of accounts receivable |  |  | 85.00% |  |  |  |  |  |
Credit available subject to percentage of cash deposited |  |  | 100.00% |  |  |  |  |  |
Canadian Subsidiaries |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Credit available subject to percentage of accounts receivable |  |  | 85.00% |  |  |  |  |  |
Credit available subject to percentage of cash deposited |  |  | 100.00% |  |  |  |  |  |
Term Loan Agreement | Eurodollar |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 2.00% |  |  |  |  |  |  |
Term Loan Agreement | Base rate loans |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 1.00% |  |  |  |  |  |  |
Term Loan Agreement | Minimum | Base rate loans |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 0.00% |  |  |  |  |  |  |
Secured Debt | Term Loan Agreement |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Face amount |  | $ 400,000,000.0 |  |  |  |  |  |  |
Fair value of notes |  |  | $ 400,500,000 |  |  |  |  |  |
Effective interest rate |  |  |  |  |  | 3.57% |  |  |
Premiums to repay debt early | $ 6,000,000 |  |  |  |  |  |  |  |
Expenses incurred from financing | 6,500,000 |  |  |  |  |  |  |  |
Secured Debt | Repurchased Notes |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Repurchased amount |  | 296,200,000 |  |  |  |  |  |  |
Amount used to repurchase notes |  | 312,600,000 |  |  |  |  |  |  |
Accrued interest paid |  | 6,400,000 |  |  |  |  |  |  |
Unsecured Debt | Senior unsecured notes, at 5.25%, due August 1, 2020 (2020 Notes) |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Face amount |  | $ 503,800,000 |  |  |  |  |  |  |
Repurchased amount | $ 103,800,000 |  |  |  |  |  |  |  |
Redemption price percentage | 101.313% |  |  |  |  |  |  |  |
Senior Notes | Senior unsecured notes, at 5.25%, due August 1, 2020 (2020 Notes) |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  | $ 800,000,000
Interest rate |  |  | 5.25% |  |  |  |  |  | 5.25%
Fair value of notes |  |  | $ 404,600,000 | 820,000,000 |  |  |  |  |
Repurchased amount |  |  | $ 400,000,000 |  |  |  |  |  |
Senior Notes | Senior unsecured notes, at 5.125%, due June 1, 2021 (2021 Notes) |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  | $ 250,000,000.0 | $ 600,000,000.0 |
Interest rate |  |  | 5.125% |  |  |  |  | 5.125% |
Fair value of notes |  |  | $ 855,700,000 | $ 861,900,000 |  |  |  |  |
Repurchased amount |  |  |  |  | $ 5,000,000 |  |  |  |
Revolving credit facility |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity |  |  | $ 400,000,000.0 |  |  |  |  |  |
Period for measurement of average liquidity |  |  | 30 days |  |  |  |  |  |
Revolving credit facility | Minimum |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Commitment fee |  |  | 0.25% |  |  |  |  |  |
Revolving credit facility | Minimum | LIBOR loans |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 1.25% |  |  |  |  |  |
Revolving credit facility | Minimum | Base rate loans |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 0.25% |  |  |  |  |  |
Revolving credit facility | Maximum |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Commitment fee |  |  | 0.30% |  |  |  |  |  |
Revolving credit facility | Maximum | LIBOR loans |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 1.50% |  |  |  |  |  |
Revolving credit facility | Maximum | Base rate loans |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 0.50% |  |  |  |  |  |
Revolving credit facility | Parent and Domestic Subsidiaries |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity |  |  | $ 300,000,000 |  |  |  |  |  |
Revolving credit facility | Canadian Subsidiaries |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity |  |  | 100,000,000 |  |  |  |  |  |
Letters of credit | Parent and Domestic Subsidiaries |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity |  |  | 250,000,000 |  |  |  |  |  |
Letters of credit | Canadian Subsidiaries |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity |  |  | $ 75,000,000 |  |  |  |  |  |

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- Definition Credit Available Subject to Percentage of Cash Deposited + References No definition available. + Details
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- Definition Amount of cash paid for interest. Includes, but is not limited to, payment to settle zero-coupon bond attributable to accreted interest of debt discount and debt instrument with insignificant coupon interest rate in relation to effective interest rate of borrowing attributable to accreted interest of debt discount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4297-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
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