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FINANCING ARRANGEMENTS - Narrative (Details) - USD ($) |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 17, 2019 | Jul. 02, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Available to borrow and outstanding letters of credit |  |  | $ 231,100,000 |  |  | $ 231,100,000 |  | $ 235,400,000
Outstanding letters of credit |  |  | 147,200,000 |  |  | 147,200,000 |  | 130,100,000
Loss on early extinguishment |  |  | 6,119,000 | $ 6,100,000 | $ 2,469,000 | 6,119,000 | $ 2,469,000 |
Debt fair value |  |  | $ 1,600,000,000 |  |  | $ 1,600,000,000 |  | 1,600,000,000
Effective interest rate percentage |  |  | 4.67% |  |  | 4.67% |  |
Derivative liability |  |  | $ 25,300,000 |  |  | $ 25,300,000 |  | 8,800,000
Term Loan Agreement |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt outstanding |  |  | 736,600,000 |  |  | 736,600,000 |  |
Term Loans with Interest Rate Swap Agreements |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt outstanding |  |  | $ 350,000,000.0 |  |  | $ 350,000,000.0 |  |
Unsecured debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Redemption percentage of principal amount |  |  |  |  |  | 100.00% |  |
Redemption percentage (up to) |  |  |  |  |  | 35.00% |  |
Unsecured debt | 2021 Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Purchased notes | $ 144,000,000.0 | $ 701,000,000.0 |  |  |  |  |  |
Repayments of debt |  | 706,200,000 |  |  |  |  |  |
Accrued interest | $ 900,000 | 3,100,000 |  |  |  |  |  |
Interest rate (as a percentage) |  |  | 5.125% |  |  | 5.125% |  |
Unsecured debt | Unsecured senior notes, at 4.875%, due July 15, 2027 (2027 Notes) |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt aggregate principal amount |  | 545,000,000.0 |  |  |  |  |  |
Redemption percentage of principal amount |  |  |  |  |  | 104.875% |  |
Interest rate (as a percentage) |  |  | 4.875% |  |  | 4.875% |  |
Unsecured debt | Unsecured senior notes, at 5.125%, due July 15, 2029 (2029 Notes) |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt aggregate principal amount |  | $ 300,000,000.0 |  |  |  |  |  |
Redemption percentage of principal amount |  |  |  |  |  | 105.125% |  |
Interest rate (as a percentage) |  |  | 5.125% |  |  | 5.125% |  |
Revolving Credit Facility | Line of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Revolving credit facility maximum borrowing capacity |  |  | $ 400,000,000.0 |  |  | $ 400,000,000.0 |  | 400,000,000.0
Debt outstanding |  |  | 0 |  |  | $ 0 |  | $ 0
Eurodollar |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate percentage |  |  |  |  |  | 1.75% |  |
Interest Rate Swap |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Notional amount of interest rate swap agreements |  |  | $ 350,000,000.0 |  |  | $ 350,000,000.0 |  |
Interest rate percentage |  |  |  |  |  | 2.92% |  |

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