Subsequent Events (Details) - Subsequent Event - USD ($) $ in Millions	Feb. 17, 2016	Feb. 12, 2016
Subsequent Event [Line Items]
Aggregate purchase price for accelerate share repurchase program		$ 50
Number of shares to be repurchased under accelerated share repurchase program	4,200,000.0

Amount of cash receipt from (payment to) bank; or stock received from (issuance to) bank in the settlement of the accelerated share repurchase agreement.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 25
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653

Name:	us-gaap_AcceleratedShareRepurchasesSettlementPaymentOrReceipt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant