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Revenues Revenues (Narrative) (Details)	12 Months Ended
Revenues Revenues (Narrative) (Details)	Dec. 31, 2018	Dec. 31, 2017
Revenue Recognition, Leases [Abstract]
New Accounting Pronouncement or Change in Accounting Principle, Description	22.2	21.9

Disclosure related to a new accounting pronouncement or a change in accounting principle, including the nature and reason for the change and the effect of the change on prior periods and the current period.

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