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Financing Arrangements (Details 1) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Long-term debt
Total Long-term debt	$ 455.5	$ 464.7
Less current maturities	0.2	9.6
Long-term debt	455.3	455.1
Series A Medium Term Note [Member]
Long-term debt
Total Long-term debt	175.0	175.0
Senior Unsecured Notes [Member]
Long-term debt
Total Long-term debt	249.9	249.9
Ohio Water Development Revenue Refunding Bonds [Member]
Long-term debt
Total Long-term debt	12.2	12.2
Ohio Air Quality Development Revenue Refunding Bonds [Member]
Long-term debt
Total Long-term debt	9.5	9.5
Ohio Pollution Control Revenue Refunding Bonds [Member]
Long-term debt
Total Long-term debt	8.5	8.5
Other Long Term Debt [Member]
Long-term debt
Total Long-term debt	$ 0.4	$ 9.6

X

- Definition

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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Carrying amount of long-term debt, net of 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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