Commitments and Contingencies Commitments and Contingencies - Environmental Textuals (Details) - USD ($)	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Payments to Prepare Former Operation Location for Sale	$ 10.2	$ 4.6
Environmental-related assets	$ 23,400,000	24,500,000
Discontinued Operations [Member]
Accrual for Environmental Loss Contingencies, Increase (Decrease) for Revision in Estimates		$ 3,700,000

Amount of expense (reversal of expense) which increases (decreases) the accrual for environmental loss contingencies from revisions in estimates to existing obligations. Excludes changes related to business acquisitions, divestitures, or currency movement.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 5.Y.Q2)
-URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751

Name:	us-gaap_AccrualForEnvironmentalLossContingenciesIncreaseDecreaseForRevisionInEstimates
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration