Accounts and Notes Receivable (Narrative) (Details) $ in Millions	Dec. 31, 2017 USD ($)
Receivables [Abstract]
Insurance recoveries related to environmental matters	$ 28.7

Amount due in settlement of a claim for reimbursement from an insurance company when the Company has suffered a loss covered under an insurance policy.

No definition available.

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