Commitments and Contingencies Regulatory Matters (Details) $ in Millions	1 Months Ended
Apr. 30, 2016 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Customer Refund Payments	$ 16.6

Amount of cash outflow to customers for refund payments.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 13.A.4(a))
-URI http://asc.fasb.org/extlink&oid=65893310&loc=d3e214044-122780

Name:	us-gaap_CustomerRefundableFeesRefundPayments1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration