Summary Of Major Accounting Policies Summary of Major Accounting Policies - Dispositions (Details) $ in Millions	12 Months Ended
Dec. 31, 2018 USD ($)
Dispositions [Abstract]
Proceeds from sale of assets	$ 15.1
Gain (Loss) on Sale of Assets and Asset Impairment Charges	$ 9.3

Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2443-110228

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration