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Other Bond Issuances (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jun. 30, 2013 Pollution Control Bonds [Member]	May 23, 2013 Pollution Control Bonds [Member] Subsidiaries [Member]	May 23, 2013 5.000% Series Due 2031 [Member] Subsidiaries [Member]	May 23, 2013 3.910% Series Due 2031 [Member] Subsidiaries [Member]	Mar. 01, 2023 Scenario, Forecast [Member] Pollution Control Bonds [Member] Subsidiaries [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross		$ 161.9
Debt Instrument, Interest Rate, Stated Percentage			5.01%	3.91%
Debt Instrument, Redemption Payment Term, Percentage of Principal Amount					100.00%
Gains (Losses) on Extinguishment of Debt	$ (18.0)

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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