FAIR VALUE MEASUREMENTS (Details) $ in Millions |
12 Months Ended | |
|---|---|---|
|
Dec. 31, 2016
USD ($)
Transfer
|
Dec. 31, 2015
USD ($)
Transfer
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Transfers in out between levels | Transfer | 0 | 0 |
| Fair value of total debt | $ 144.3 | $ 188.1 |
| Carrying amount of long-term debt | 141.2 | 183.5 |
| Investments held in Rabbi Trust [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Available-for-sale securities measured at fair value | 1.7 | 3.6 |
| Investments held in Rabbi Trust [Member] | SERP [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Gross unrealized gains associated with the investment held in the rabbi trust | 0.7 | 0.7 |
| Nonrecurring [Member] | ||
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Financial assets accounted at fair value | $ 0.0 | $ 0.0 |