DEBT - SUMMARY (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Debt
Total Debt	$ 924.9	$ 958.4
Less current portion	(53.4)	(48.4)
Total Long-term Debt	871.5	910.0
5.79%, payable through 2020
Debt
Total Debt	$ 3.5	$ 3.5
Interest rate (as a percent)	5.79%	5.79%
3.66%, payable through 2023
Debt
Total Debt	$ 31.9	$ 31.9
Interest rate (as a percent)	3.66%	3.66%
4.16%, payable through 2027
Debt
Total Debt	$ 39.3	$ 39.3
Interest rate (as a percent)	4.16%	4.16%
3.37 %, payable through 2027
Debt
Total Debt	$ 75.0	$ 75.0
Interest rate (as a percent)	3.37%	3.37%
3.14%, payable through 2031
Debt
Total Debt	$ 178.8	$ 188.0
Interest rate (as a percent)	3.14%	3.14%
4.31%, payable through 2032
Debt
Total Debt	$ 30.3	$ 30.3
Interest rate (as a percent)	4.31%	4.31%
4.35%, payable through 2044
Debt
Total Debt	$ 100.0	$ 100.0
Interest rate (as a percent)	4.35%	4.35%
3.92%, payable through 2045
Debt
Total Debt	$ 69.5	$ 69.5
Interest rate (as a percent)	3.92%	3.92%
5.34%, payable through 2028
Debt
Total Debt	$ 18.7	$ 19.8
Interest rate (as a percent)	5.34%	5.34%
5.27%, payable through 2029
Debt
Total Debt	$ 20.9	$ 22.0
Interest rate (as a percent)	5.27%	5.27%
Revolving Credit Facility
Debt
Total Debt	$ 357.0	$ 379.1
Funds available under the revolving credit facility	$ 163.6
Interest rate during period (as a percent)	3.50%