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DEBT - SUMMARY (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Debt
Total Debt	$ 760.1	$ 958.4
Less current portion	(59.2)	(48.4)
Total Long-term Debt	700.9	910.0
Less: Deferred loan fees	(15.3)
Total Long-term Debt, net of deferred loan fees	$ 685.6	910.0
5.79%, payable through 2020
Debt
Total Debt		3.5
Interest rate (as a percent)	5.79%
3.66%, payable through 2023
Debt
Total Debt	$ 22.8	31.9
Interest rate (as a percent)	3.66%
4.16%, payable through 2027
Debt
Total Debt	$ 34.0	39.3
Interest rate (as a percent)	4.16%
3.37 %, payable through 2027
Debt
Total Debt	$ 75.0	75.0
Interest rate (as a percent)	3.37%
3.14%, payable through 2031
Debt
Total Debt	$ 169.6	188.0
Interest rate (as a percent)	3.14%
4.31%, payable through 2032
Debt
Total Debt	$ 27.9	30.3
Interest rate (as a percent)	4.31%
4.35%, payable through 2044
Debt
Total Debt		100.0
Interest rate (as a percent)	4.35%
3.92%, payable through 2045
Debt
Total Debt		69.5
Interest rate (as a percent)	3.92%
5.34%, payable through 2028
Debt
Total Debt	$ 17.6	19.8
Interest rate (as a percent)	5.34%
5.27%, payable through 2029
Debt
Total Debt	$ 19.8	22.0
Interest rate (as a percent)	5.27%
1.22 %, payable through 2043
Debt
Total Debt	$ 182.0
Interest rate (as a percent)	1.22%
1.35 %, payable through 2044
Debt
Total Debt	$ 139.6
Interest rate (as a percent)	1.35%
Revolving Credit Facility
Debt
Total Debt	$ 71.8	$ 379.1
Funds available under the revolving credit facility	$ 570.1
Interest rate during period (as a percent)	2.50%

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