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Regulatory Matters - The Patient Protection and Affordable Care Act of 2010 (PPACA) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			3 Months Ended	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Jun. 30, 2011 Elimination of Medicare Part D [Member]	Dec. 31, 2010 Elimination of Medicare Part D [Member]
Unusual or Infrequent Item [Line Items]
Reversal of Previously Recorded Tax Benefit					$ 4.0
Deferred Income Tax Benefit	7.3	8.3		(2.9)
Non-Current Regulatory Assets	$ 336.6		$ 340.3	$ 5.0

X

- Definition

The component of income tax expense for the period representing the increase (decrease) in the entity's deferred tax assets and liabilities pertaining to continuing operations.

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-Name Statement of Financial Accounting Standard (FAS)

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-Paragraph 289

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-Name Staff Accounting Bulletin (SAB)

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Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are not expected to be recovered through revenue sources within one year or the normal operating cycle if longer.

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Reflects the effects of adjustments of previously recorded tax expense, significant settlements of income tax disputes, and unusual tax positions or infrequent actions taken by the entity, including tax assessment reversal, IRS tax settlement and unusual repatriation of foreign earnings.

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