Partnership Income, Expense and Cash Distributions Available for Sale Securities - Ohio (Details) (USD $) In Millions, unless otherwise specified			24 Months Ended		24 Months Ended
Jun. 30, 2010 Integer	Jun. 29, 2010	Jun. 30, 2012 Series A [Member]	Jun. 30, 2010 Series A [Member]	Jun. 30, 2012 Series B [Member]	Jun. 30, 2010 Series B [Member]
Available-for-sale Securities	$ 18.3			$ 14.7		$ 3.6
percent of return, securities, available for sale			7.00%		10.00%
Available-for-Sale Securities, Asset Ownership	100.00%	99.00%
series, securities, available for sale	2

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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+ Details