Subsequent Events (Narrative) (Details) (Subsequent Event [Member], USD $) In Millions, unless otherwise specified	0 Months Ended
Oct. 23, 2013
Subsequent Event [Member]
Subsequent Event [Line Items]
Share repurchase program, authorized amount	$ 500.0

Amount of a stock repurchase plan authorized by an entity's Board of Directors.

No definition available.

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