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LONG-TERM DEBT - Additional information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Long Term Debt |  |
Outstanding borrowings | $ 714.5 | $ 780.5
Senior unsecured notes - due November 15, 2022 |  |
Long Term Debt |  |
Outstanding borrowings | 397.4 | 495.3
Notional amount | $ 400.3 |
Borrowings, interest rate | 6.25% |
Principal amount repurchased and cancelled | $ 99.7 |
Principal amount repurchased and cancelled, transaction costs | $ 0.3 |
Interest Coverage Ratio | minimum interest coverage incurrence covenant of earnings before interest, taxes, depreciation, amortization, impairment, and other non-cash adjustments to interest of 2:1. |
Transaction Costs Capitalized | $ 9.9 |
Senior unsecured notes - due May 15, 2025 |  |
Long Term Debt |  |
Outstanding borrowings | 287.1 | 285.2
Notional amount | $ 300.0 | $ 300.0
Borrowings, interest rate | 6.375% |
Interest Coverage Ratio | minimum interest coverage incurrence covenant of earnings before interest, taxes, depreciation, amortization, impairment, and other non-cash adjustments to interest of 2:1 |
Borrowing costs incurred | $ 10.7 |
Borrowings Redemption Price Percentage | 100.00% |
Credit Facility |  |
Long Term Debt |  |
Standby fees on undrawn amounts under credit facility, Percentage | 0.73% | 0.73%
Letters Of Credit Issued | $ 118.9 | $ 110.8
Credit Facility Full Interest Rate | 3.25% | 3.25%
Increase Decrease The Capacity for Credit Facility | $ 400.0 |
Proceeds from non-current borrowings | $ 30.0 |
Credit Facility | Bottom of range [member] |  |
Long Term Debt |  |
Standby fees on undrawn amounts under credit facility, Percentage | 0.51% |
Credit Facility Full Interest Rate | 1.25% |
Credit Facility | Top of range [member] |  |
Long Term Debt |  |
Standby fees on undrawn amounts under credit facility, Percentage | 0.84% |
Credit Facility Full Interest Rate | 3.75% |

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