Basis of Presentation Increase to Cash Flow from Investing Abstract (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Increase to Cash from Investing Activity [Abstract]
ASU 2016-18 Reclassification Adjustment	$ (5.9)	$ 3.6

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