Summary Of Significant Accounting Policies (Details) $ in Millions	Dec. 31, 2016 USD ($) regulatory_commission	Oct. 31, 2016 USD ($)
Accounting Policies [Abstract]
Number Of Regulatory Commissions \| regulatory_commission	3
Unbilled revenues \| $	$ 76.6	$ 13.4

Amount received for services rendered and products shipped, but not yet billed, for non-contractual agreements due within one year or the normal operating cycle, if longer.

No definition available.

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