DEBT - SUMMARY (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Debt
Capital leases	$ 2.3	$ 3.1
Total Debt	462.8	429.9
Less current portion	(21.8)	(22.0)
Total Long-term Debt	441.0	407.9
5.79%, payable through 2020
Debt
Total Debt	$ 28.0	$ 31.5
Interest rate (as a percent)	5.79%	5.79%
3.66%, payable through 2023
Debt
Total Debt	$ 63.8	$ 68.4
Interest rate (as a percent)	3.66%	3.66%
4.16%, payable through 2027
Debt
Total Debt	$ 55.0	$ 55.0
Interest rate (as a percent)	4.16%	4.16%
4.31%, payable through 2032
Debt
Total Debt	$ 37.5	$ 37.5
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	$ 75.0	$ 75.0
Interest rate (as a percent)	3.92%	3.92%
5.34%, payable through 2028
Debt
Total Debt	$ 27.5	$ 28.6
Interest rate (as a percent)	5.34%	5.34%
5.27%, payable through 2029
Debt
Total Debt	$ 29.7	$ 30.8
Interest rate (as a percent)	5.27%	5.27%
Revolving Credit Facility
Debt
Total Debt	$ 44.0