Accounting Policies (Details) $ in Millions	6 Months Ended
Jun. 30, 2018 USD ($)
Increase to Cash Flow from Operations [Abstract]
Prior period reclassification adjustment	$ 6.0

The amount of a reclassification adjustment made to prior period financial statement amounts.

No definition available.

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