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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
Financial instruments not recorded at fair value
Long-term debt	$ 3,081.3us-gaap_LongTermDebt	$ 3,056.2us-gaap_LongTermDebt
Preferred stock of subsidiary – $100 par value; 1,000,000 shares authorized; 511,882 shares issued; 510,495 shares outstanding	51.1us-gaap_PreferredStockValue	51.1us-gaap_PreferredStockValue
Carrying Amount
Financial instruments not recorded at fair value
Long-term debt	3,081.3	3,056.2
Preferred stock of subsidiary – $100 par value; 1,000,000 shares authorized; 511,882 shares issued; 510,495 shares outstanding	51.1	51.1
Fair value
Financial instruments not recorded at fair value
Long-term debt	3,271.4	3,031.6
Preferred stock of subsidiary – $100 par value; 1,000,000 shares authorized; 511,882 shares issued; 510,495 shares outstanding	$ 51.8	$ 61.2

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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