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DEBT (Details) (USD $) In Millions, unless otherwise specified																				6 Months Ended	1 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jan. 31, 2014 Debt Instrument Redemption 2021 [Member]	Jan. 31, 2014 Debt Instrument Redemption 2022 and 2023 [Member]	Jan. 31, 2014 Debt Instrument Redemption 2024 to 2027 [Member]	Jan. 31, 2014 Debt Instrument Redemption 2028 [Member]	Jan. 31, 2014 Debt Instrument Redemption 2029 and thereafter until 2044 [Member]	Jun. 30, 2014 Term Loans Payable5.79 Percent Through2020 [Member]	Dec. 31, 2013 Term Loans Payable5.79 Percent Through2020 [Member]	Jun. 30, 2014 Term Loans Payable3.66 Percent Through2023 [Member]	Dec. 31, 2013 Term Loans Payable3.66 Percent Through2023 [Member]	Jun. 30, 2014 Term Loans Payable4.16 Percent Through2027 [Member]	Dec. 31, 2013 Term Loans Payable4.16 Percent Through2027 [Member]	Jun. 30, 2014 Term Loans Payable4.31 Percent Through2032 [Member]	Dec. 31, 2013 Term Loans Payable4.31 Percent Through2032 [Member]	Jun. 30, 2014 Secured Bonds Payable5.34 Percent Through2028 [Member]	Dec. 31, 2013 Secured Bonds Payable5.34 Percent Through2028 [Member]	Jun. 30, 2014 Secured Bonds Payable5.27 Percent Through2029 [Member]	Dec. 31, 2013 Secured Bonds Payable5.27 Percent Through2029 [Member]	Jun. 30, 2014 Term Notes Payable4.35 Percent Through2044 [Member]	Jan. 31, 2014 Senior Unsecured Long Term Debt [Member]
Debt
Capital leases	$ 1.9	$ 2.4
Total debt	379.9	286.1						42.0	45.5	77.5	77.5	55.0	55.0	37.5	37.5	31.9	33.0	34.1	35.2	100.0
Less current portion	(17.1)	(12.5)
Total long-term debt	362.8	273.6
Interest rate (as a percent)								5.79%	5.79%	3.66%	3.66%	4.16%	4.16%	4.31%	4.31%	5.34%	5.34%	5.27%	5.27%	4.35%	4.35%
Debt issued																					100
Debt instrument term																					30 years
Weighted average period																				14 years 6 months
Annual principal payments			$ 5.0	$ 7.5	$ 10.0	$ 8.0	$ 2.0

X

- Definition

Represents the weighted average period of the tranches of unsecured long-term debt in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 7



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- Definition

Amount of the total principal payments made during the annual reporting period.

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Face (par) amount of debt instrument at time of issuance.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt and capital lease obligation due after one year or beyond the normal operating cycle, if longer.

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Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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