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DEBT (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Sep. 30, 2003	Aug. 31, 2004
Debt
Capital leases	$ 1.3us-gaap_CapitalLeaseObligations	$ 2.4us-gaap_CapitalLeaseObligations
Total debt	373.6us-gaap_LongTermDebt	286.1us-gaap_LongTermDebt	319.1us-gaap_LongTermDebt
Less current portion	(21.6)us-gaap_LongTermDebtCurrent	(12.5)us-gaap_LongTermDebtCurrent	(16.4)us-gaap_LongTermDebtCurrent
Total long-term debt	352.0	273.6	302.7
Current borrowing capacity	6.0
Debt maturities
2015	21.6
2016	20.7
2017	28.2
2018	28.2
2019	28.2
Thereafter	246.7
Term Loans Payable5.79 Percent Through2020
Debt
Total debt	38.5	45.5	52.5
Interest rate (as a percent)	5.79%	5.79%
Term Loans Payable3.66 Percent Through2023
Debt
Total debt	77.5	77.5	77.5
Interest rate (as a percent)	3.66%	3.66%
Term Loans Payable4.16 Percent Through2027
Debt
Total debt	55.0	55.0	55.0
Interest rate (as a percent)	4.16%	4.16%
Term Loans Payable4.31 Percent Through2032
Debt
Total debt	37.5	37.5	37.5
Interest rate (as a percent)	4.31%	4.31%
Term Loans Payable4.35 Percent Through2044
Debt
Total debt	100.0
Interest rate (as a percent)	4.35%
Secured Bonds Payable5.34 Percent Through2028
Debt
Total debt	30.8	33.0	35.2
Interest rate (as a percent)	5.34%	5.34%		5.34%
Secured Bonds Payable5.27 Percent Through2029
Debt
Total debt	$ 33.0	$ 35.2	$ 37.4
Interest rate (as a percent)	5.27%	5.27%			5.27%