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FAIR VALUE - FINANCIAL INSTRUMENTS NOT RECORDED AT FAIR VALUE (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Carrying value and estimated fair value of financial instruments
Preferred stock	$ 51.1us-gaap_PreferredStockValue	$ 51.1us-gaap_PreferredStockValue
Carrying Amount
Carrying value and estimated fair value of financial instruments
Long-term Debt	3,081.3	3,081.3
Preferred stock	51.1	51.1
Fair value
Carrying value and estimated fair value of financial instruments
Long-term Debt	3,328.0	3,271.4
Preferred stock	$ 52.3	$ 51.8

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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