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FINANCING ARRANGEMENTS (Narrative) (Details) |  |  |  | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |
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Aug. 02, 2018 | Aug. 01, 2018 USD ($) | Jul. 19, 2018 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2018 USD ($) | Apr. 17, 2018 | Sep. 30, 2017 | Mar. 14, 2016 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2012 USD ($) | Jul. 30, 2012 USD ($)
Financing arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing from revolving credit facility |  |  |  |  | $ 50,000,000 | $ 0 | $ 0 |  |  |  |  |  |  |
Settlement of borrowing |  |  |  |  | 50,000,000 | 0 | $ 0 |  |  |  |  |  |  |
Revolving credit facility, available borrowing capacity |  |  |  | $ 235,400,000 | 235,400,000 | 217,800,000 |  |  |  |  |  |  |  |
Letters of credit outstanding, amount |  |  |  | 130,100,000 | 130,100,000 | 134,100,000 |  |  |  |  |  |  |  |
Effective interest rate (as a percent) | 4.67% |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative liability |  |  |  | 8,800,000 | $ 8,800,000 |  |  |  |  |  |  |  |  |
Eurodollar |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) | 1.75% |  |  |  |  |  |  |  |  |  |  |  |  |
Parent and Domestic Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit available subject to percentage of accounts receivable (as a percent) |  |  |  |  | 85.00% |  |  |  |  |  |  |  |  |
Credit available subject to percentage of cash deposited (as a percent) |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |
Canadian Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit available subject to percentage of accounts receivable (as a percent) |  |  |  |  | 85.00% |  |  |  |  |  |  |  |  |
Credit available subject to percentage of cash deposited (as a percent) |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |
Term Loan Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase in principal amount of initial term loans |  |  | $ 350,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Debt outstanding |  |  |  | 742,200,000 | $ 742,200,000 |  |  |  |  |  |  |  |  |
Senior unsecured notes, at 5.25%, due August 1, 2020 (2020 Notes) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  | 330,900,000 |  |  |  |  |  |  |  |  |  |  |
Accrued interest |  |  | 7,900,000 |  |  |  |  |  |  |  |  |  |  |
Debt redemption fees |  |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |
Term Loans with Interest Rate Swap Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt outstanding |  |  |  |  |  |  |  | $ 350,000,000 |  |  |  |  |  |
Secured Debt | First Amendment | Eurodollar |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction of applicable interest rate margin |  |  |  |  |  |  |  |  | 0.0025 |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  | 1.75% |  |  |  |  |
Secured Debt | First Amendment | Base rate loans |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction of applicable interest rate margin |  |  |  |  |  |  |  |  | 0.0025 |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  | 0.75% |  |  |  |  |
Secured Debt | Term Loan Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of notes |  |  |  | $ 707,000,000 | $ 707,000,000 | 400,500,000 |  |  |  |  |  |  |  |
Effective interest rate (as a percent) |  |  |  |  |  |  |  |  |  | 4.27% |  |  |  |
Senior Notes | Senior unsecured notes, at 5.25%, due August 1, 2020 (2020 Notes) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 5.25% | 5.25% |  |  |  |  |  |  |  |  | 5.25%
Redemption of 2020 Notes |  | $ 78,000,000 | $ 322,000,000 |  |  |  |  |  |  |  |  |  |  |
Fair value of notes |  |  |  |  |  | 404,600,000 |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 800,000,000
Repurchased amount |  |  |  | $ 400,000,000 | $ 400,000,000 | 400,000,000.0 |  |  |  |  |  |  |  |
Senior Notes | Senior unsecured notes, at 5.125%, due June 1, 2021 (2021 Notes) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 5.125% | 5.125% |  |  |  |  |  |  |  | 5.125% |
Fair value of notes |  |  |  | $ 845,000,000 | $ 845,000,000 | 855,700,000 |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  |  |  | $ 250,000,000.0 |  | $ 600,000,000.0 |
Repurchased amount |  |  |  |  |  |  |  |  |  |  |  | $ 5,000,000.0 |  |
Revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity |  |  |  | 400,000,000.0 | $ 400,000,000.0 |  |  |  |  |  |  |  |  |
Period for measurement of average liquidity (in days) |  |  |  |  | 30 days |  |  |  |  |  |  |  |  |
Revolving credit facility | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee (as a percent) |  |  |  |  | 0.25% |  |  |  |  |  |  |  |  |
Revolving credit facility | Minimum | LIBOR loans |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  | 1.25% |  |  |  |  |  |  |  |  |
Revolving credit facility | Minimum | Base rate loans |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  | 0.25% |  |  |  |  |  |  |  |  |
Revolving credit facility | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee (as a percent) |  |  |  |  | 0.30% |  |  |  |  |  |  |  |  |
Revolving credit facility | Maximum | LIBOR loans |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  | 1.50% |  |  |  |  |  |  |  |  |
Revolving credit facility | Maximum | Base rate loans |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  | 0.50% |  |  |  |  |  |  |  |  |
Revolving credit facility | Parent and Domestic Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity |  |  |  | 300,000,000 | $ 300,000,000 |  |  |  |  |  |  |  |  |
Revolving credit facility | Canadian Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity |  |  |  | 100,000,000 | 100,000,000 |  |  |  |  |  |  |  |  |
Letters of credit | Parent and Domestic Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity |  |  |  | 250,000,000 | 250,000,000 |  |  |  |  |  |  |  |  |
Letters of credit | Canadian Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility, maximum borrowing capacity |  |  |  | 75,000,000 | 75,000,000 |  |  |  |  |  |  |  |  |
Interest rate swap |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) | 2.92% |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of interest rate swap agreements |  |  |  |  |  |  |  | $ 350,000,000.0 |  |  |  |  |  |
Revolving credit facility | Revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowing from revolving credit facility |  | $ 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Settlement of borrowing |  |  |  | 50,000,000 |  |  |  |  |  |  |  |  |  |
Debt outstanding |  |  |  | $ 0 | $ 0 | $ 0 |  |  |  |  |  |  |  |

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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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