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FAIR VALUE - FINANCIAL INSTRUMENTS NOT RECORDED AT FAIR VALUE (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Carrying value and estimated fair value of financial instruments
Long-term debt	$ 1,174.5us-gaap_LongTermDebt	$ 1,174.5us-gaap_LongTermDebt
Long-term debt to parent	5.4	6.3
Preferred stock – $100 par value; 1,000,000 shares authorized; 511,882 shares issued and outstanding	51.2us-gaap_PreferredStockValue	51.2us-gaap_PreferredStockValue
Carrying Amount
Carrying value and estimated fair value of financial instruments
Long-term debt	1,174.5	1,174.5
Long-term debt to parent	5.4	6.3
Preferred stock – $100 par value; 1,000,000 shares authorized; 511,882 shares issued and outstanding	51.2	51.2
Fair Value
Carrying value and estimated fair value of financial instruments
Long-term debt	1,286.2	1,176.5
Long-term debt to parent	5.7	7.1
Preferred stock – $100 par value; 1,000,000 shares authorized; 511,882 shares issued and outstanding	$ 52.0	$ 61.4

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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