Business And Summary Of Significant Accounting Policies (Details) (USD $) In Millions	3 Months Ended
Jun. 30, 2010
Business And Summary Of Significant Accounting Policies
Increase in net income as a result of restatement	$ 40
Net income after prior period restatement	$ 87.0

Resulting effect of restatement to correct an error, after tax effects, on the net income of prior periods for the year in which any adjustments are first made. In statements containing more than one period, discloses the effects for each period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 9
-Paragraph 26

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 154
-Paragraph 17, 18, 26

Name:	us-gaap_RestatementOfPriorYearIncomeNetOfTax
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration