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LONG-TERM OBLIGATIONS (Tables) | 12 Months Ended
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Dec. 31, 2020
Debt Disclosure [Abstract] |
Schedule of Debt | Letters of credit outstanding (in millions):
| December 31, 2020 |  | December 31, 2019
$400 Million Facility | $ | — |  |  |  |  |  |  | $ | — |  |  |  |  |
$300 Million Facility | 35.3 |  |  |  |  |  |  | 34.8 |  |  |  |  |
Bilateral Arrangements | 47.2 |  |  |  |  |  |  | 45.3 |  |  |  |  |
Total | $ | 82.5 |  |  |  |  |  |  | $ | 80.1 |  |  |  |  |
Schedule of Long-term Debt Instruments | Long-term debt is summarized as follows (in millions):
| December 31,
| 2020 |  | 2019
5-5/8% Senior Notes due February 1, 2025, net of unamortized debt issuance costs of $6.0 and $7.5 at December 31, 2020 and 2019, respectively | $ | 594.0 |  |  | $ | 592.5 |
2017 Credit Agreement – term debt due January 31, 2024 (“Original Term Loan”, as defined below), net of unamortized debt issuance costs of $3.0 and $4.0 at December 31, 2020 and 2019, respectively | 381.0 |  |  | 383.8 |
2017 Credit Agreement – term debt due January 31, 2024 (“2019 Term Loan”, as defined below), net of unamortized debt issuance costs of $1.6 and $2.1 at December 31, 2020 and 2019, respectively | 194.3 |  |  | 195.6 |
Finance lease obligations | 4.4 |  |  | 3.7 |
Other | 0.1 |  |  | 0.1 |
Total debt | 1,173.8 |  |  | 1,175.7 |
Less: Current portion of long-term debt | (7.6) |  |  | (6.9) |
Long-term debt, less current portion | $ | 1,166.2 |  |  | $ | 1,168.8 |
Schedule of Maturities of Long-term Debt | Amounts shown are exclusive of minimum lease payments for capital lease obligations (in millions):
2021 | $ | 6.0 |
2022 | 5.5 |
2023 | 5.5 |
2024 | 563.0 |
2025 | 600.0 |
Total Debt | 1,180.0 |
Less: Unamortized debt issuance costs | $ | (10.6) |
Net debt | $ | 1,169.4 |
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments | Based on indicative price quotations from financial institutions multiplied by the amount recorded on the Company’s Consolidated Balance Sheet (“Book Value”), the Company estimates the fair values of its debt set forth below as of December 31, 2020 and 2019, as follows (in millions, except for quotes):
2020 | Book Value |  | Quote |  | Fair Value
5-5/8% Notes | $ | 600.0 |  |  | $ | 1.02750 |  |  | $ | 616.5 |
2017 Credit Agreement - Original Term Loan (net of discount) | $ | 384.0 |  |  | $ | 0.98750 |  |  | $ | 379.2 |
2017 Credit Agreement - 2019 Term Loan (net of discount) | $ | 195.9 |  |  | $ | 0.99000 |  |  | $ | 193.9 |
2019 | Book Value |  | Quote |  | Fair Value
5-5/8% Notes | $ | 600.0 |  |  | $ | 1.03375 |  |  | $ | 620.3 |
2017 Credit Agreement - Original Term Loan (net of discount) | $ | 387.8 |  |  | $ | 1.00656 |  |  | $ | 390.3 |
2017 Credit Agreement - 2019 Term Loan (net of discount) | $ | 197.7 |  |  | $ | 1.00938 |  |  | $ | 199.6 |

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