DEBT - SUMMARY (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Debt
Capital leases		$ 0.1
Capital leases	$ 0.0
Total Debt	958.4	856.4
Less current portion	(48.4)	(42.1)
Total Long-term Debt	910.0	814.3
5.79%, payable through 2020
Debt
Total Debt	$ 3.5	10.5
Interest rate (as a percent)	5.79%
3.66%, payable through 2023
Debt
Total Debt	$ 31.9	41.0
Interest rate (as a percent)	3.66%
4.16%, payable through 2027
Debt
Total Debt	$ 39.3	44.5
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	$ 188.0	200.0
Interest rate (as a percent)	3.14%
4.31%, payable through 2032
Debt
Total Debt	$ 30.3	32.7
Interest rate (as a percent)	4.31%
4.35%, payable through 2044
Debt
Total Debt	$ 100.0	100.0
Interest rate (as a percent)	4.35%
3.92%, payable through 2045
Debt
Total Debt	$ 69.5	71.4
Interest rate (as a percent)	3.92%
5.34%, payable through 2028
Debt
Total Debt	$ 19.8	22.0
Interest rate (as a percent)	5.34%
5.27%, payable through 2029
Debt
Total Debt	$ 22.0	24.2
Interest rate (as a percent)	5.27%
Revolving Credit Facility
Debt
Total Debt	$ 379.1	$ 235.0
Funds available under the revolving credit facility	$ 75.1
Interest rate during period (as a percent)	3.33%