Share Repurchase Program (Details) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended
Jul. 31, 2012	Aug. 31, 2011	Jun. 30, 2013
Stock Repurchase Program, Authorized Amount	$ 100.0	$ 100.0
Treasury Stock, Shares			3,707,424
Treasury Stock Acquired,Cost Per Share			$ 26.09
Treasury Shares, Acquired, Value			$ 96.7

The amount authorized by an entity's Board of Directors under a stock repurchase plan.

No definition available.

Name:	us-gaap_StockRepurchaseProgramAuthorizedAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration