Subsequent Event (Details) (USD $) In Millions, except Per Share data	1 Months Ended
Jul. 29, 2011	Jul. 01, 2011
Subsequent Event
Cash dividend per share		$ 0.20
Total dividend paid in subsequent period	$ 19.0

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 32

Name:	us-gaap_DividendsPayableAmountPerShare
Namespace Prefix:	us-gaap
Data Type:	us-types:perShareItemType
Balance Type:	na
Period Type:	instant